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Financial Commitments (Narrative) (Details) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2016 USD ($) contract $ / shares shares | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Sep. 30, 2016 | Mar. 31, 2016
Debt Instrument [Line Items] |  |  |  |  |
Issuance of convertible notes | $ 200,000,000 |  |  |  |
Equipment Financing, Mortgages And Acquisition-Related Notes [Abstract] |  |  |  |  |
Loan outstanding | 759,519,000 | $ 817,684,000 |  |  |
Operating leases, rent expense | 28,200,000 | 17,400,000 | $ 24,400,000 |  |
Letter Of Credit [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Face amount | 150,000,000 |  |  |  |
Letters of credit outstanding | $ 200,000 |  |  |  |
Convertible Notes [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt issuance date | Jun. 15, 2016 |  |  |  |
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, principal amount | $ 1,000 |  |  |  |
Conversion price | $ / shares | $ 30.25 |  |  |  |
Imputed interest rate (as a percent) | 9.39% |  |  |  |
Equipment Financing, Mortgages And Acquisition-Related Notes [Abstract] |  |  |  |  |
Loan outstanding | $ 152,668,000 |  |  |  |
Convertible Notes [Member] | Circumstance One [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Business day period after consecutive trading day period | 5 days |  |  |  |
Consecutive trading day period | 10 days |  |  |  |
Percentage of conversion price | 98.00% |  |  |  |
Conversion price, principal amount | $ 1,000 |  |  |  |
Convertible Notes [Member] | Circumstance Two [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Business day period after consecutive trading day period | 20 days |  |  |  |
Percentage of conversion price | 130.00% |  |  |  |
Conversion price | $ / shares | $ 39.32 |  |  |  |
Term Loan [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Face amount | $ 250,000,000 |  |  |  |
Prepayment of debt | $ 125,000,000 |  |  |  |
Imputed interest rate (as a percent) | 4.68% |  |  |  |
Equipment Financing, Mortgages And Acquisition-Related Notes [Abstract] |  |  |  |  |
Loan outstanding | $ 54,650,000 | 222,120,000 |  |  |
2010 Notes [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Face amount | $ 300,000,000 |  |  |  |
Interest rate (as a percent) | 7.625% |  |  |  |
Maturity date | Nov. 01, 2018 |  |  |  |
Imputed interest rate (as a percent) | 7.99% |  |  |  |
Equipment Financing, Mortgages And Acquisition-Related Notes [Abstract] |  |  |  |  |
Loan outstanding | $ 298,120,000 | 297,118,000 |  |  |
Equipment Financing Loans [Member] |  |  |  |  |
Equipment Financing, Mortgages And Acquisition-Related Notes [Abstract] |  |  |  |  |
Loan outstanding | $ 84,900,000 | 115,600,000 |  |  |
Transportation-Equipment Financing Loans [Member] |  |  |  |  |
Equipment Financing, Mortgages And Acquisition-Related Notes [Abstract] |  |  |  |  |
Term of debt | 10 years |  |  |  |
Transportation-Equipment Financing Loans Ballon Payment 2021 [Member] |  |  |  |  |
Equipment Financing, Mortgages And Acquisition-Related Notes [Abstract] |  |  |  |  |
Balloon payments | $ 12,400,000 |  |  |  |
Transportation-Equipment Financing Loans Ballon Payment 2022 [Member] |  |  |  |  |
Equipment Financing, Mortgages And Acquisition-Related Notes [Abstract] |  |  |  |  |
Balloon payments | 6,300,000 |  |  |  |
Mortgages [Member] |  |  |  |  |
Equipment Financing, Mortgages And Acquisition-Related Notes [Abstract] |  |  |  |  |
Loan outstanding | $ 16,700,000 | 17,700,000 |  |  |
Interest rate, minimum (as a percent) | 2.50% |  |  |  |
Term of debt | 7 years |  |  |  |
Mortgages Balloon Payment in 2018 [Member] |  |  |  |  |
Equipment Financing, Mortgages And Acquisition-Related Notes [Abstract] |  |  |  |  |
Balloon payments | $ 2,600,000 |  |  |  |
Mortgages Balloon Payment in 2021 [Member] |  |  |  |  |
Equipment Financing, Mortgages And Acquisition-Related Notes [Abstract] |  |  |  |  |
Balloon payments | 2,900,000 |  |  |  |
Mortgages Balloon Payment in 2023 [Member] |  |  |  |  |
Equipment Financing, Mortgages And Acquisition-Related Notes [Abstract] |  |  |  |  |
Balloon payments | $ 6,700,000 |  |  |  |
Minimum [Member] | Convertible Notes [Member] | Circumstance Two [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Consecutive trading day period | 30 days |  |  |  |
Minimum [Member] | Equipment Financing Loans [Member] |  |  |  |  |
Equipment Financing, Mortgages And Acquisition-Related Notes [Abstract] |  |  |  |  |
Interest rate, minimum (as a percent) | 1.90% |  |  |  |
Maximum [Member] | Equipment Financing Loans [Member] |  |  |  |  |
Equipment Financing, Mortgages And Acquisition-Related Notes [Abstract] |  |  |  |  |
Interest rate, maximum (as a percent) | 5.93% |  |  |  |
2014 Credit Facility [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Maturity date | May 01, 2018 |  |  |  |
Number of amendments | contract | 2 |  |  |  |
Maximum adjustment to Applicable Rate (as a percent) | 1.00% |  |  |  |
Percentage of foreign restricted subsidiary stock pledged as collateral | 65.00% |  |  |  |
Imputed interest rate (as a percent) | 9.86% |  |  |  |
2014 Credit Facility [Member] | Minimum [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Consolidated leverage ratio | 3.00 |  |  |  |
2014 Credit Facility [Member] | Maximum [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Consolidated leverage ratio | 3.25 |  |  |  |
2014 Credit Facility [Member] | Amendment One [Member] | Minimum [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Consolidated leverage ratio | 3.50 |  |  |  |
2014 Credit Facility [Member] | Amendment One [Member] | Maximum [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Consolidated leverage ratio |  |  |  | 4.25 | 4.00
2014 Revolver [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Repayment of debt | $ 69,000,000 |  |  |  |
Maximum borrowing capacity | $ 300,000,000 |  |  |  |
Imputed interest rate (as a percent) | 5.05% |  |  |  |
Outstanding borrowings | $ 147,300,000 |  |  |  |
Equipment Financing, Mortgages And Acquisition-Related Notes [Abstract] |  |  |  |  |
Loan outstanding | 147,990,000 | 155,815,000 |  |  |
Brightwater Matter [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Pre-tax charges |  | 23,900,000 |  |  |
Five Star Electric [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Pre-tax charges |  | $ 45,600,000 |  |  |
Liability Component [Member] | Convertible Notes [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Face amount | 200,000,000 |  |  |  |
Issuance of convertible notes | 153,200,000 |  |  |  |
Unamortized debt issuance costs | 5,051,000 |  |  |  |
Reclassified amortization of deferred debt issuance costs | 4,519,000 |  |  |  |
Equity Component [Member] | Convertible Notes [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Conversion feature | 46,800,000 |  |  |  |
Unamortized debt issuance costs | $ 1,543,000 |  |  |  |
Prime Rate [Member] | 2014 Revolver [Member] | Minimum [Member] | Term Loan [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Basis spread on variable 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% |  |  |  |
Prime Rate [Member] | 2014 Revolver [Member] | Maximum [Member] | Term Loan [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Basis spread on variable 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] | Mortgages [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Basis spread on variable 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] | 2014 Revolver [Member] | Minimum [Member] | Term Loan [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Basis spread on variable 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] | 2014 Revolver [Member] | Maximum [Member] | Term Loan [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Basis spread on variable 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% |  |  |  |

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