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

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- Definition

Debt Instrument, Convertible, Debt Principal Amount

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- Definition

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

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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.

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- Definition

Equipment Financing, Mortgages And Acquisition-Related Notes [Abstract]

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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 Increase, Removed By Amendment

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No definition available.

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- Definition

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

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No definition available.

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- Definition

Amount of amortization expense attributable to debt issuance costs.

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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.

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

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No definition available.

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- Definition

The carrying amount of the equity component of convertible debt which may be settled in cash upon conversion.

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- Definition

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

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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.

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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.

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No definition available.

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

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No definition available.

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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.

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No definition available.

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

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

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

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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.

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No definition available.

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

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Amount of payment greater than the preceding installment payments to be paid at final maturity date of debt.

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No definition available.

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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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Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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No definition available.

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Weighted average interest rate of debt outstanding.

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No definition available.

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

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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.

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

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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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Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income.

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The cash inflow from the issuance of a long-term debt instrument which can be exchanged for a specified amount of another security, typically the entity's common stock, at the option of the issuer or the holder.

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Indebtedness divided by net capital.

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Financial Commitments (Narrative) (Details)		12 Months Ended
Financial Commitments (Narrative) (Details)	Apr. 20, 2017 USD ($)	Dec. 31, 2018 USD ($) d / item $ / shares shares	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Debt Instrument [Line Items]
Issuance of convertible notes				$ 200,000,000
Equipment Financing, Mortgages And Acquisition-Related Notes [Abstract]
Loan outstanding		$ 761,504,000	$ 736,276,000
Operating leases, rent expense		24,300,000	27,400,000	$ 28,200,000
Equity Component [Member]
Debt Instrument [Line Items]
Unamortized debt issuance costs		1,500,000
Liability Component [Member]
Debt Instrument [Line Items]
Unamortized debt issuance costs		$ 5,100,000
Senior Notes [Member] \| 2017 Senior Notes [Member]
Debt Instrument [Line Items]
Imputed interest rate (as a percent)		7.13%
Equipment Financing, Mortgages And Acquisition-Related Notes [Abstract]
Loan outstanding		$ 493,521,000	492,734,000
Senior Notes [Member] \| 2010 Senior Notes [Member]
Debt Instrument [Line Items]
Face amount	$ 300,000,000
Interest rate (as a percent)	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 (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, shares \| shares		33.0579
Conversion price \| $ / shares		$ 30.25
Imputed interest rate (as a percent)		9.39%
Equipment Financing, Mortgages And Acquisition-Related Notes [Abstract]
Loan outstanding		$ 171,481,000	161,635,000
Convertible Notes [Member] \| Equity Component [Member]
Debt Instrument [Line Items]
Conversion feature		46,800,000	46,800,000
Unamortized debt issuance costs		1,543,000	1,543,000
Convertible Notes [Member] \| Liability Component [Member]
Debt Instrument [Line Items]
Face amount		200,000,000	200,000,000
Issuance of convertible notes		153,200,000
Unamortized debt issuance costs		5,051,000	5,051,000
Reclassified amortization of deferred debt issuance costs		$ 23,332,000	13,486,000
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
Equipment Financing Loans [Member]
Equipment Financing, Mortgages And Acquisition-Related Notes [Abstract]
Loan outstanding		$ 38,600,000	61,100,000
Term of debt		10 years
Equipment Financing Loans [Member] \| Forecast [Member]
Equipment Financing, Mortgages And Acquisition-Related Notes [Abstract]
Balloon payments						$ 6,300,000	$ 12,400,000
Mortgages [Member]
Debt Instrument [Line Items]
Interest rate (as a percent)		3.50%
Equipment Financing, Mortgages And Acquisition-Related Notes [Abstract]
Loan outstanding		$ 12,300,000	15,700,000
Mortgages [Member] \| Forecast [Member]
Equipment Financing, Mortgages And Acquisition-Related Notes [Abstract]
Balloon payments					$ 7,000,000		$ 2,900,000
Minimum [Member] \| Equipment Financing Loans [Member]
Debt Instrument [Line Items]
Interest rate (as a percent)		2.19%
Maximum [Member] \| Equipment Financing Loans [Member]
Debt Instrument [Line Items]
Interest rate (as a percent)		3.38%
Credit Facility [Member] \| 2017 Credit Facility [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity		$ 350,000,000
Available borrowing capacity		$ 309,000,000
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		4.77%
Fixed charge coverage ratio, Required		1.25
Unamortized debt issuance costs		$ 4,800,000	$ 6,200,000
Revolver optional increase removed by amendment		150,000,000
Equipment Financing, Mortgages And Acquisition-Related Notes [Abstract]
Loan outstanding		41,000,000
Credit Facility [Member] \| 2014 Credit Facility [Member]
Debt Instrument [Line Items]
Face amount	$ 300,000,000
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 \| 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] \| Mortgages [Member]
Debt Instrument [Line Items]
Basis points added to reference rate (as a percent))		3.00%
Equipment Financing, Mortgages And Acquisition-Related Notes [Abstract]
Basis points added to reference rate (as a percent)		3.00%
LIBOR [Member] \| Credit Facility [Member] \| Minimum [Member] \| 2017 Credit Facility [Member]
Debt Instrument [Line Items]
Basis points added to reference rate (as a percent))		1.50%
Equipment Financing, Mortgages And Acquisition-Related Notes [Abstract]
Basis points added to reference rate (as a percent)		1.50%
LIBOR [Member] \| Credit Facility [Member] \| Maximum [Member] \| 2017 Credit Facility [Member]
Debt Instrument [Line Items]
Basis points added to reference rate (as a percent))		3.00%
Equipment Financing, Mortgages And Acquisition-Related Notes [Abstract]
Basis points added to reference rate (as a percent)		3.00%
Base Rate [Member] \| Credit Facility [Member] \| Circumstance Three [Member] \| 2017 Credit Facility [Member]
Debt Instrument [Line Items]
Basis points added to reference rate (as a percent))		100.00%
Equipment Financing, Mortgages And Acquisition-Related Notes [Abstract]
Basis points added to reference rate (as a percent)		100.00%
Base Rate [Member] \| Credit Facility [Member] \| Circumstance Four [Member] \| 2017 Credit Facility [Member]
Debt Instrument [Line Items]
Interest rate (as a percent)		0.00%
Base Rate [Member] \| Credit Facility [Member] \| Minimum [Member] \| 2017 Credit Facility [Member]
Debt Instrument [Line Items]
Basis points added to reference rate (as a percent))		0.50%
Equipment Financing, Mortgages And Acquisition-Related Notes [Abstract]
Basis points added to reference rate (as a percent)		0.50%
Base Rate [Member] \| Credit Facility [Member] \| Maximum [Member] \| 2017 Credit Facility [Member]
Debt Instrument [Line Items]
Basis points added to reference rate (as a percent))		2.00%
Equipment Financing, Mortgages And Acquisition-Related Notes [Abstract]
Basis points added to reference 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 points added to reference rate (as a percent))		50.00%
Equipment Financing, Mortgages And Acquisition-Related Notes [Abstract]
Basis points added to reference rate (as a percent)		50.00%