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.

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- Definition

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

+ References

No definition available.

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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.

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- 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.

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No definition available.

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- Definition

Line of Credit Facility, Additional Borrowing Available

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- Definition

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

+ References

No definition available.

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- 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

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- Definition

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

+ References

No definition available.

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- Definition

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

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- 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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- 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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- 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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- 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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Period Type:	duration

- Definition

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

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- Definition

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

+ References

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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

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

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- Definition

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

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- Definition

Weighted average interest rate of debt outstanding.

+ References

No definition available.

+ Details

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- 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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- Definition

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

+ References

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- 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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- Definition

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

+ References

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- Definition

Indebtedness divided by net capital.

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No definition available.

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Financial Commitments (Narrative) (Details)		9 Months Ended
Financial Commitments (Narrative) (Details)	Apr. 20, 2017 USD ($)	Sep. 30, 2018 USD ($) d / item $ / shares shares	Dec. 31, 2017 USD ($)
Senior Notes [Member] \| 2017 Senior Notes [Member]
Debt Instrument [Line Items]
Effective interest rates		7.13%
Senior Notes [Member] \| 2010 Senior Notes [Member]
Debt Instrument [Line Items]
Face amount	$ 300,000,000
Interest rate	7.625%
Maturity date	Nov. 01, 2018
Senior Notes [Member] \| Private Placement [Member] \| 2017 Senior Notes [Member]
Debt Instrument [Line Items]
Face amount		$ 500,000,000
Interest rate		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		2.875%
Maturity date		Jun. 15, 2021
Conversion price \| $ / shares		$ 30.25
Effective interest rates		9.39%
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
Credit Facility [Member] \| 2017 Credit Facility [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity		$ 350,000,000
Available borrowing capacity		272,000,000
Additional borrowing		$ 150,000,000
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		4.64%
Fixed charge coverage ratio		1.25
Debt issuance costs		$ 5,100,000	$ 6,200,000
Credit Facility [Member] \| 2014 Credit Facility [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 300,000,000
Line of Credit Facility, Expiration Date	May 01, 2018
Credit Facility [Member] \| Letters Of Credit [Member] \| 2017 Credit Facility [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity		150,000,000
Credit Facility [Member] \| Swingline Loans [Member] \| 2017 Credit Facility [Member]
Debt Instrument [Line Items]
Face amount		$ 10,000,000
Credit Facility [Member] \| Term Loan [Member] \| 2014 Credit Facility [Member]
Debt Instrument [Line Items]
Face amount	$ 250,000,000
Credit Facility [Member] \| Minimum [Member[ \| 2017 Credit Facility [Member]
Debt Instrument [Line Items]
Consolidated leverage ratio		3.25
Credit Facility [Member] \| Maximum [Member] \| 2017 Credit Facility [Member]
Debt Instrument [Line Items]
Consolidated leverage ratio		4.00
LIBOR [Member] \| Credit Facility [Member] \| Minimum [Member[ \| 2017 Credit Facility [Member]
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent))		1.50%
LIBOR [Member] \| Credit Facility [Member] \| Maximum [Member] \| 2017 Credit Facility [Member]
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent))		3.00%
Base Rate [Member] \| Credit Facility [Member] \| Circumstance Three [Member] \| 2017 Credit Facility [Member]
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent))		1.00%
Base Rate [Member] \| Credit Facility [Member] \| Circumstance Four [Member] \| 2017 Credit Facility [Member]
Debt Instrument [Line Items]
Interest rate		0.00%
Base Rate [Member] \| Credit Facility [Member] \| Minimum [Member[ \| 2017 Credit Facility [Member]
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent))		0.50%
Base Rate [Member] \| Credit Facility [Member] \| Maximum [Member] \| 2017 Credit Facility [Member]
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent))		2.00%
Federal Funds Rate [Member] \| Credit Facility [Member] \| Circumstance Two [Member] \| 2017 Credit Facility [Member]
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent))		0.50%