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Amount of assets pledged to secure a debt instrument.

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

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

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

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Write-off of amounts previously capitalized as debt issuance cost in an extinguishment of debt.

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Debt - Narrative (Details) $ in Thousands	1 Months Ended	3 Months Ended	6 Months Ended
Debt - Narrative (Details) $ in Thousands	May 31, 2021 USD ($)	Jun. 30, 2021 USD ($)	Jun. 30, 2021 USD ($) item	Dec. 31, 2020 USD ($)	Aug. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Oct. 31, 2019 USD ($)	Mar. 31, 2019 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Jul. 31, 2016 USD ($)	May 31, 2015 USD ($)	Nov. 18, 2014 USD ($)
Debt Instrument [Line Items]
Long-term Debt, Total		$ 1,533,567	$ 1,533,567
Long-term Debt, Gross		1,543,040	1,543,040
Amount of gain (loss) on early extinguishment of debt		(14,614)	(14,614)
Write off of Deferred Debt Issuance Cost			1,250
Long-term Line of Credit				$ 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		0	0
Mortgages [Member]
Debt Instrument [Line Items]
Long-term Debt, Total		32,782	32,782	33,122
Long-term Debt, Gross		33,040	33,040	$ 33,434
Debt Instrument, Collateral Amount		$ 39,400	$ 39,400
Long-term Debt, Weighted Average Interest Rate		4.18%	4.18%	4.21%
Unsecured Debt [Member]
Debt Instrument [Line Items]
Long-term Debt, Total				$ 237,849
Long-term Debt, Gross				240,000
Unsecured Debt [Member] \| 2023 Term Loan [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross				40,000
Debt Instrument, Interest Rate, Effective Percentage	2.40%
Unsecured Debt [Member] \| 2024 Term Loan Facilities[Member]
Debt Instrument [Line Items]
Long-term Debt, Gross				100,000
Debt Instrument, Interest Rate, Effective Percentage	2.86%
Unsecured Debt [Member] \| 2026 Term Loan [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross				100,000
Debt Instrument, Interest Rate, Effective Percentage	4.26%
Senior Unsecured Debt [Member]
Debt Instrument [Line Items]
Long-term Debt, Total		$ 1,494,399	$ 1,494,399	855,328
Long-term Debt, Gross		1,510,000	1,510,000	860,000
Amount of gain (loss) on early extinguishment of debt	$ 14,600
Swap Termination Costs	13,400
Write off of Deferred Debt Issuance Cost	$ 1,200
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	50,000
Debt Instrument, Interest Rate, Stated Percentage		4.16%	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	50,000
Debt Instrument, Interest Rate, Stated Percentage		4.26%	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	60,000
Debt Instrument, Interest Rate, Stated Percentage	2.00%	4.42%	4.42%
Debt Instrument, Face Amount	$ 350,000										$ 60,000
Senior Unsecured Debt [Member] \| 2028 Senior Unsecured Notes [Member] \| Blended All-In Including Interest Rate Swap [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Effective Percentage	2.11%
Debt Instrument, Face Amount	$ 350,000
Senior Unsecured Debt [Member] \| 2029 Senior Unsecured Notes [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross		$ 100,000	$ 100,000	100,000
Debt Instrument, Interest Rate, Stated Percentage		4.19%	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	125,000
Debt Instrument, Interest Rate, Stated Percentage		4.32%	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	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					3.50%
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	$ 125,000
Debt Instrument, Interest Rate, Stated Percentage		4.41%	4.41%				4.47%
Debt Instrument, Face Amount		$ 100,000	$ 100,000				$ 125,000	$ 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%	4.42%
Debt Instrument, Face Amount		$ 125,000	$ 125,000
Senior Unsecured Debt [Member] \| 2033 Senior Unsecured Public Notes [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross		300,000	$ 300,000
Debt Instrument, Interest Rate, Stated Percentage	2.60%
Debt Instrument, Face Amount	$ 300,000
Senior Unsecured Debt [Member] \| 2033 Senior Unsecured Public Notes [Member] \| Interest rate swap
Debt Instrument [Line Items]
Derivative Notional Amount, Terminated	300,000
Proceeds From Termination	$ 16,700
Senior Unsecured Debt [Member] \| 2033 Senior Unsecured Public Notes [Member] \| Blended All-In Including Interest Rate Swap [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Effective Percentage	2.13%
Debt Instrument, Face Amount	$ 300,000
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	$ 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
Senior Unsecured Debt [Member] \| 2024 Term Loan Facility Two [Member] \| Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount						$ 35,000