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Financial Commitments (Narrative) (Details) |  | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Apr. 19, 2017 USD ($) | Dec. 31, 2017 USD ($) d / item $ / shares shares | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2018 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Issuance of convertible notes |  |  | $ 200,000,000 |  |  |  |  |
Equipment Financing, Mortgages And Acquisition-Related Notes [Abstract] |  |  |  |  |  |  |  |
Loan outstanding |  | $ 736,276,000 | 759,519,000 |  |  |  |  |
Operating leases, rent expense |  | $ 27,400,000 | 28,200,000 | $ 17,400,000 |  |  |  |
Letters Of Credit [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Face amount | $ 150,000,000 |  |  |  |  |  |  |
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 |  | $ 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 |  |  |  |  |  |  |
Equipment Financing, Mortgages And Acquisition-Related Notes [Abstract] |  |  |  |  |  |  |  |
Loan outstanding |  |  | 298,120,000 |  |  |  |  |
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 |  | $ 161,635,000 | 152,668,000 |  |  |  |  |
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 |  | $ 13,486,000 | 4,519,000 |  |  |  |  |
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 |  |  |  |  |  |
Term Loan |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Face amount | $ 250,000,000 |  |  |  |  |  |  |
Equipment Financing, Mortgages And Acquisition-Related Notes [Abstract] |  |  |  |  |  |  |  |
Loan outstanding |  |  | 54,650,000 |  |  |  |  |
Equipment Financing Loans [Member] |  |  |  |  |  |  |  |
Equipment Financing, Mortgages And Acquisition-Related Notes [Abstract] |  |  |  |  |  |  |  |
Loan outstanding |  | $ 61,100,000 | 84,900,000 |  |  |  |  |
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) |  | 2.50% |  |  |  |  |  |
Equipment Financing, Mortgages And Acquisition-Related Notes [Abstract] |  |  |  |  |  |  |  |
Loan outstanding |  | $ 15,700,000 | 16,700,000 |  |  |  |  |
Term of debt |  | 7 years |  |  |  |  |  |
Mortgages [Member] | Forecast [Member] |  |  |  |  |  |  |  |
Equipment Financing, Mortgages And Acquisition-Related Notes [Abstract] |  |  |  |  |  |  |  |
Balloon payments |  |  |  |  | $ 7,000,000 |  | $ 2,900,000 | $ 2,600,000
Minimum [Member] | Equipment Financing Loans [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest rate (as a percent) |  | 1.90% |  |  |  |  |  |
Maximum [Member] | Equipment Financing Loans [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest rate (as a percent) |  | 5.93% |  |  |  |  |  |
Credit Facility [Member] | 2017 Credit Facility [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Maximum borrowing capacity |  | $ 350,000,000 |  |  |  |  |  |
Available borrowing capacity |  | $ 350,000,000 |  |  |  |  |  |
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 |  | 3.89% |  |  |  |  |  |
Fixed charge coverage ratio, Required |  | 1.25 |  |  |  |  |  |
Unamortized debt issuance costs |  | $ 6,200,000 |  |  |  |  |  |
Revolver optional increase removed by amendment |  | 150,000,000 |  |  |  |  |  |
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 |  |  |  |  |  |  |
Equipment Financing, Mortgages And Acquisition-Related Notes [Abstract] |  |  |  |  |  |  |  |
Loan outstanding |  |  | $ 147,990,000 |  |  |  |  |
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] | 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] | Minimum [Member] | Term Loan | 2014 Credit Facility [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Basis points added to reference rate (as a percent)) | 1.25% |  |  |  |  |  |  |
Equipment Financing, Mortgages And Acquisition-Related Notes [Abstract] |  |  |  |  |  |  |  |
Basis points added to reference rate (as a percent) | 1.25% |  |  |  |  |  |  |
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% |  |  |  |  |  |
LIBOR [Member] | Credit Facility [Member] | Maximum [Member] | Term Loan | 2014 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% |  |  |  |  |  |

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