Annual Percentage Increase To Debt Instrument Basis Spread On Variable Rate, In The Event Of Default

No definition available.

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- Definition

Debt Instrument, Convertible, Debt Principal Amount

+ References

No definition available.

+ Details

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- Definition

Debt Instrument, Convertible, Threshold Business Day Period After Consecutive Trading Day Period

+ References

No definition available.

+ Details

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- Definition

Upon the occurrence of a change of control triggering event specified in the Indenture, the Company must offer to purchase the Senior Notes at a redemption price expressed as percentage of the principal amount thereof, plus accrued and unpaid interest, if any, to the date of purchase.

+ References

No definition available.

+ Details

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Period Type:	duration

- Definition

The minimum fixed charge ratio, as defined in the line of credit agreement, which the reporting entity must maintain in order to be in compliance with the terms of the line of credit facility.

+ References

No definition available.

+ Details

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- Definition

Line Of Credit Increase Permitted

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Percentage Of Notes That Can Be Redeemed At Company's Discretion

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	duration

- Definition

The number of shares issued in exchange for the original debt being converted in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or payments in the period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 5
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Period Type:	duration

- 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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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The price per share of the conversion feature embedded in the debt instrument.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 5
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031898-161870

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Balance Type:	na
Period Type:	instant

- Definition

Price of the entity's common stock which would be required to be attained for the conversion feature embedded in the debt instrument to become effective.

+ References

No definition available.

+ Details

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Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

- Definition

Threshold period of specified consecutive trading days within which common stock price to conversion price of convertible debt instrument must exceed threshold percentage for specified number of trading days to trigger conversion feature.

+ References

No definition available.

+ Details

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Period Type:	duration

- Definition

Minimum percentage of common stock price to conversion price of convertible debt instruments to determine eligibility of conversion.

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	duration

- Definition

Threshold number of specified trading days that common stock price to conversion price of convertible debt instruments must exceed threshold percentage within a specified consecutive trading period to trigger conversion feature.

+ References

No definition available.

+ Details

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Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
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+ Details

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

- Definition

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

+ References

+ Details

Name:	us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- 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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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
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+ Details

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Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
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+ Details

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Balance Type:	na
Period Type:	duration

- Definition

Weighted average interest rate of debt outstanding.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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Balance Type:	debit
Period Type:	instant

- Definition

Date the credit facility terminates, in CCYY-MM-DD format.

+ References

+ Details

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Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- 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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Balance Type:	credit
Period Type:	instant

- Definition

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

+ References

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Indebtedness divided by net capital.

+ References

No definition available.

+ Details

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Financial Commitments (Narrative) (Details)	3 Months Ended
Financial Commitments (Narrative) (Details)	Mar. 31, 2020 USD ($) d / item $ / shares shares	Dec. 31, 2019 USD ($)	May 07, 2019	Apr. 20, 2017
Senior Notes [Member] \| Private Placement [Member] \| 2017 Senior Notes [Member]
Debt Instrument [Line Items]
Face amount	$ 500,000,000
Interest rate (as a percent)	6.875%
Redemption price, change of control triggering event (as a percent)	101.00%
Senior Notes [Member] \| Circumstance One [Member] \| Private Placement [Member] \| 2017 Senior Notes [Member]
Debt Instrument [Line Items]
Redemption price	100.00%
Senior Notes [Member] \| Circumstance Two [Member] \| Private Placement [Member] \| 2017 Senior Notes [Member]
Debt Instrument [Line Items]
Redemption price	106.875%
Percentage of notes that can be redeemed	40.00%
Convertible Notes [Member]
Debt Instrument [Line Items]
Face amount	$ 200,000,000
Interest rate (as a percent)	2.875%
Maturity date	Jun. 15, 2021
Conversion price, principal amount	$ 1,000
Conversion price, shares \| shares	33.0579
Conversion price \| $ / shares	$ 30.25
Convertible Notes [Member] \| Circumstance One [Member]
Debt Instrument [Line Items]
Business day period after consecutive trading day period	5 days
Consecutive trading day period \| d / item	10
Conversion price, principal amount	$ 1,000
Percentage of conversion price	98.00%
Convertible Notes [Member] \| Circumstance Two [Member]
Debt Instrument [Line Items]
Consecutive trading day period \| d / item	30
Percentage of conversion price	130.00%
Business day period within consecutive trading day period \| d / item	20
Conversion stock price trigger \| $ / shares	$ 39.32
Conversion price, shares \| shares	33.0579
Minimum [Member] \| 2017 Credit Facility [Member]
Debt Instrument [Line Items]
Maximum consolidated leverage ratio				3.25
Maximum [Member] \| 2017 Credit Facility [Member]
Debt Instrument [Line Items]
Maximum consolidated leverage ratio				3.50
Revolving Credit Facility [Member] \| 2017 Credit Facility [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 350,000,000
Available borrowing capacity	$ 175,000,000
Line of Credit Facility, Expiration Date	Apr. 20, 2022
Applicable margin and letter of credit fees will be increased percentage per annum.	2.00%
Weighted-average annual interest rate on borrowings	4.20%
Minimum fixed charge coverage ratio, Required	1.25
Unamortized debt issuance costs	$ 3,300,000	$ 3,700,000
Line of credit increase permitted	150,000,000
Revolving Credit Facility [Member] \| Letters Of Credit [Member] \| 2017 Credit Facility [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity	150,000,000
Revolving Credit Facility [Member] \| Swingline Loans [Member] \| 2017 Credit Facility [Member]
Debt Instrument [Line Items]
Face amount	$ 10,000,000
Revolving Credit Facility [Member] \| Minimum [Member] \| 2017 Credit Facility [Member]
Debt Instrument [Line Items]
Maximum consolidated leverage ratio	3.25
Revolving Credit Facility [Member] \| Maximum [Member] \| 2017 Credit Facility [Member]
Debt Instrument [Line Items]
Maximum consolidated leverage ratio	4.00
Revolving Credit Facility [Member] \| Maximum [Member] \| Amendment To 2017 Credit Facility [Member]
Debt Instrument [Line Items]
Maximum consolidated leverage ratio			3.50
LIBOR \| Revolving Credit Facility [Member] \| Minimum [Member] \| 2017 Credit Facility [Member]
Debt Instrument [Line Items]
Basis points added to reference rate (as a percent))	1.50%
LIBOR \| Revolving Credit Facility [Member] \| Maximum [Member] \| 2017 Credit Facility [Member]
Debt Instrument [Line Items]
Basis points added to reference rate (as a percent))	3.00%
Base Rate [Member] \| Revolving Credit Facility [Member] \| Circumstance Three [Member] \| 2017 Credit Facility [Member]
Debt Instrument [Line Items]
Basis points added to reference rate (as a percent))	1.00%
Base Rate [Member] \| Revolving Credit Facility [Member] \| Circumstance Four [Member] \| 2017 Credit Facility [Member]
Debt Instrument [Line Items]
Interest rate (as a percent)	0.00%
Base Rate [Member] \| Revolving Credit Facility [Member] \| Minimum [Member] \| Circumstance Four [Member] \| 2017 Credit Facility [Member]
Debt Instrument [Line Items]
Basis points added to reference rate (as a percent))	0.50%
Base Rate [Member] \| Revolving Credit Facility [Member] \| Maximum [Member] \| Circumstance Four [Member] \| 2017 Credit Facility [Member]
Debt Instrument [Line Items]
Basis points added to reference rate (as a percent))	2.00%
Federal Funds Rate [Member] \| Revolving Credit Facility [Member] \| Circumstance Two [Member] \| 2017 Credit Facility [Member]
Debt Instrument [Line Items]
Basis points added to reference rate (as a percent))	0.50%