Debt Instrument, Derivative Instrument Basis Fixed Rate

No definition available.

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- Definition

Nominal or face amount of derivative terminated.

+ References

No definition available.

+ Details

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- Definition

The number of times entity can extend the maturity date under the credit facility.

+ References

No definition available.

+ Details

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- Definition

Line of Credit Facility, Maximum Borrowing Capacity, Additional Commitments Available

+ References

No definition available.

+ Details

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Balance Type:	credit
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- Definition

The loss amount to be reimbursed per a contract

+ References

No definition available.

+ Details

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Balance Type:	debit
Period Type:	instant

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

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- Definition

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

+ References

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-Name Accounting Standards Codification
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Period Type:	instant

- Definition

Amount of assets pledged to secure a debt instrument.

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Balance Type:	debit
Period Type:	instant

- Definition

The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR.

+ References

No definition available.

+ Details

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- Definition

Face (par) amount of debt instrument at time of issuance.

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Balance Type:	credit
Period Type:	instant

- Definition

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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+ Details

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

+ Details

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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Balance Type:	credit
Period Type:	instant

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

+ Details

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Period Type:	instant

- Definition

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Weighted average interest rate of long-term debt outstanding calculated at point in time.

+ References

No definition available.

+ Details

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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Details

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- Details

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- Details

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- Details

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Debt - Narrative (Details) $ in Thousands	1 Months Ended				3 Months Ended
Debt - Narrative (Details) $ in Thousands	Oct. 31, 2019 USD ($)	Sep. 30, 2019	Dec. 31, 2018 USD ($)	Jul. 31, 2016 USD ($)	Mar. 31, 2021 USD ($) item	Dec. 31, 2020 USD ($)	Aug. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Mar. 31, 2019 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	May 31, 2015 USD ($)	Nov. 18, 2014 USD ($)
Debt Instrument [Line Items]
Long-term Debt, Total					$ 1,370,999
Long-term Debt, Gross					1,371,238
Long-term Line of Credit					238,000	$ 92,000
Maximum [Member]
Debt Instrument [Line Items]
Reimbursement Agreement, Amount													$ 14,000
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross					238,000
Mortgages [Member]
Debt Instrument [Line Items]
Long-term Debt, Total					32,953	33,122
Long-term Debt, Gross					33,238	$ 33,434
Debt Instrument, Collateral Amount					$ 39,700
Long-term Debt, Weighted Average Interest Rate					4.20%	4.21%
Unsecured Debt [Member]
Debt Instrument [Line Items]
Long-term Debt, Total					$ 237,955	$ 237,849
Long-term Debt, Gross					240,000	240,000
Unsecured Debt [Member] \| 2023 Term Loan [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross					$ 40,000	40,000
Debt Instrument, Description of Variable Rate Basis					Borrowings under the 2023 Term Loan are priced at LIBOR plus 85 to 165 basis points, depending on the Company’s credit rating. The Company entered into an interest rate swap agreement to fix LIBOR at 140 basis points until maturity
Debt Instrument, Interest Rate, Effective Percentage					2.40%
Debt Instrument, Face Amount				$ 40,000
Unsecured Debt [Member] \| 2023 Term Loan [Member] \| Interest rate swap \| LIBOR [Member]
Debt Instrument [Line Items]
Debt Instrument, Derivative Instrument Basis Fixed Rate				1.40%
Unsecured Debt [Member] \| 2023 Term Loan [Member] \| Minimum [Member] \| LIBOR [Member]
Debt Instrument [Line Items]
Spread on variable rate				0.85%
Unsecured Debt [Member] \| 2023 Term Loan [Member] \| Maximum [Member] \| LIBOR [Member]
Debt Instrument [Line Items]
Spread on variable rate				1.65%
Unsecured Debt [Member] \| 2024 Term Loan Facilities[Member]
Debt Instrument [Line Items]
Long-term Debt, Gross					$ 100,000	100,000
Debt Instrument, Interest Rate, Effective Percentage					2.86%
Unsecured Debt [Member] \| 2024 Term Loan Facilities[Member] \| Interest rate swap \| LIBOR [Member]
Debt Instrument [Line Items]
Spread on variable rate	1.43%
Debt Instrument, Derivative Instrument Basis Fixed Rate		2.13%
Unsecured Debt [Member] \| 2024 Term Loan Facilities[Member] \| Minimum [Member] \| LIBOR [Member]
Debt Instrument [Line Items]
Spread on variable rate					0.85%
Unsecured Debt [Member] \| 2024 Term Loan Facilities[Member] \| Maximum [Member] \| LIBOR [Member]
Debt Instrument [Line Items]
Spread on variable rate					1.65%
Unsecured Debt [Member] \| 2024 Term Loan Facility One [Member]
Debt Instrument [Line Items]
Debt Instrument, Description of Variable Rate Basis					Borrowings under the unsecured 2024 Term Loan Facilities bear interest at a variable LIBOR plus 85 to 165 basis points, depending on the Company’s credit rating. The Company utilized existing interest rate swap agreements to effectively fix LIBOR at 213 basis points until September 2020 for the $35 Million Term Loan and July 2021 for the $65 Million Term Loan. Additional interest rate swap agreements were entered into to fix LIBOR at 143 basis points until maturity (refer to Note 9 – Derivative Instruments and Hedging Activity).
Debt Instrument, Face Amount								$ 65,000
Unsecured Debt [Member] \| 2024 Term Loan Facility Two [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount								35,000
Unsecured Debt [Member] \| 2026 Term Loan [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross					$ 100,000	100,000
Debt Instrument, Description of Variable Rate Basis			Borrowings under the 2026 Term Loan are priced at LIBOR plus 145 to 240 basis points, depending on the Company’s credit rating. The Company entered into interest rate swap agreements to fix LIBOR at 266 basis points until maturity.
Debt Instrument, Interest Rate, Effective Percentage					4.26%
Debt Instrument, Face Amount			$ 100,000
Unsecured Debt [Member] \| 2026 Term Loan [Member] \| Interest rate swap \| LIBOR [Member]
Debt Instrument [Line Items]
Debt Instrument, Derivative Instrument Basis Fixed Rate			2.66%
Unsecured Debt [Member] \| 2026 Term Loan [Member] \| Minimum [Member] \| LIBOR [Member]
Debt Instrument [Line Items]
Spread on variable rate			1.45%
Unsecured Debt [Member] \| 2026 Term Loan [Member] \| Maximum [Member] \| LIBOR [Member]
Debt Instrument [Line Items]
Spread on variable rate			2.40%
Senior Unsecured Debt [Member]
Debt Instrument [Line Items]
Long-term Debt, Total					$ 855,454	855,328
Long-term Debt, Gross					860,000	860,000
Senior Unsecured Debt [Member] \| Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount								500,000
Senior Unsecured Debt [Member] \| Senior Unsecured Note 2025 and 2027 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount												$ 100,000
Senior Unsecured Debt [Member] \| 2025 Senior Unsecured Notes [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross					$ 50,000	50,000
Debt Instrument, Interest Rate, Stated Percentage					4.16%
Debt Instrument, Face Amount												50,000
Senior Unsecured Debt [Member] \| 2027 Senior Unsecured Notes [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross					$ 50,000	50,000
Debt Instrument, Interest Rate, Stated Percentage					4.26%
Debt Instrument, Face Amount												$ 50,000
Senior Unsecured Debt [Member] \| 2028 Senior Unsecured Notes [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross					$ 60,000	60,000
Debt Instrument, Interest Rate, Stated Percentage					4.42%
Debt Instrument, Face Amount				$ 60,000
Senior Unsecured Debt [Member] \| 2029 Senior Unsecured Notes [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross					$ 100,000	100,000
Debt Instrument, Interest Rate, Stated Percentage					4.19%
Debt Instrument, Face Amount											$ 100,000
Senior Unsecured Debt [Member] \| 2030 Senior Unsecured Notes [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross					$ 125,000	125,000
Debt Instrument, Interest Rate, Stated Percentage					4.32%
Debt Instrument, Face Amount										$ 125,000
Senior Unsecured Debt [Member] \| 2030 Senior Unsecured Public Notes [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross					$ 350,000	350,000
Debt Instrument, Interest Rate, Stated Percentage							2.90%
Debt Instrument, Face Amount							$ 350,000
Senior Unsecured Debt [Member] \| 2030 Senior Unsecured Public Notes [Member] \| Interest rate swap
Debt Instrument [Line Items]
Derivative Notional Amount, Terminated							$ 200,000
Senior Unsecured Debt [Member] \| 2030 Senior Unsecured Public Notes [Member] \| Blended All-In Including Interest Rate Swap [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Effective Percentage							3.49%
Debt Instrument, Face Amount							$ 350,000
Senior Unsecured Debt [Member] \| 2031 Senior Unsecured Notes [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross					$ 125,000	$ 125,000
Debt Instrument, Interest Rate, Stated Percentage	4.47%				4.41%
Debt Instrument, Face Amount	$ 125,000				$ 100,000				$ 100,000
Senior Unsecured Debt [Member] \| 2031 Senior Unsecured Notes [Member] \| Blended All-In Including Interest Rate Swap [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage					4.42%
Debt Instrument, Face Amount					$ 125,000
Senior Unsecured Debt [Member] \| Revolving Credit and Term Loan Facility [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity								600,000
Senior Unsecured Debt [Member] \| Revolving Credit and Term Loan Facility [Member] \| Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Debt Instrument, Description of Variable Rate Basis					(i) LIBOR plus a margin that is based upon the Company’s credit rating, or (ii) the Base Rate (which is defined as the greater of the rate of interest as publicly announced from time to time by PNC Bank, National Association, as its prime rate, the Federal Funds Open Rate plus 0.50%, or the Daily Eurodollar Rate plus 1.0%) plus a margin that is based upon the Company’s credit rating. The margins for the Revolving Credit Facility range in amount from 0.775% to 1.450% for LIBOR-based loans and 0.00% to 0.45% for Base Rate loans, depending on the Company’s credit rating. The margins for the Revolving Credit Facility are subject to improvement based on the Company’s leverage ratio, provided its credit rating meets a certain threshold.
Line of Credit Facility, Maximum Borrowing Capacity, Additional Commitments Available					$ 500,000
Credit facility extension times \| item					2
Senior Unsecured Debt [Member] \| Revolving Credit and Term Loan Facility [Member] \| Revolving Credit Facility [Member] \| Fed Funds Effective Rate Overnight Index Swap Rate [Member]
Debt Instrument [Line Items]
Spread on variable rate					0.50%
Senior Unsecured Debt [Member] \| Revolving Credit and Term Loan Facility [Member] \| Revolving Credit Facility [Member] \| Eurodollar [Member]
Debt Instrument [Line Items]
Spread on variable rate					1.00%
Senior Unsecured Debt [Member] \| Revolving Credit and Term Loan Facility [Member] \| Revolving Credit Facility [Member] \| Minimum [Member] \| LIBOR [Member]
Debt Instrument [Line Items]
Spread on variable rate					0.775%
Senior Unsecured Debt [Member] \| Revolving Credit and Term Loan Facility [Member] \| Revolving Credit Facility [Member] \| Minimum [Member] \| Base Rate [Member]
Debt Instrument [Line Items]
Spread on variable rate					0.00%
Senior Unsecured Debt [Member] \| Revolving Credit and Term Loan Facility [Member] \| Revolving Credit Facility [Member] \| Maximum [Member] \| LIBOR [Member]
Debt Instrument [Line Items]
Spread on variable rate					1.45%
Senior Unsecured Debt [Member] \| Revolving Credit and Term Loan Facility [Member] \| Revolving Credit Facility [Member] \| Maximum [Member] \| Base Rate [Member]
Debt Instrument [Line Items]
Spread on variable rate					0.45%
Senior Unsecured Debt [Member] \| 2024 Term Loan Facility One [Member] \| Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount								65,000
Long-term Line of Credit					$ 238,000
Senior Unsecured Debt [Member] \| 2024 Term Loan Facility Two [Member] \| Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount								$ 35,000