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Debt And Liquidity (Narrative) (Details) |  |  | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Feb. 27, 2015 USD ($) | Nov. 30, 2010 USD ($) | Dec. 31, 2015 USD ($) | Sep. 30, 2015 USD ($) | Jul. 28, 2015 USD ($) | Dec. 31, 2014 USD ($) | Apr. 23, 2014 USD ($) | Nov. 20, 2012
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Other Long-term Debt, Current |  |  | $ 367,200,000 |  |  | $ 529,700,000 |  |
Long-term debt |  |  | $ 362,455,000 |  |  | 341,615,000 |  |
Senior subordinated notes implied rate |  |  | 7.00% |  |  |  |  |
Loan balance, net of unamortized discount |  |  | $ 367,227,000 |  |  | 529,719,000 |  |
Debt Instrument, Covenant, Cash Minimum Interest Coverage Ratio, Minimum |  |  | 600.0 |  |  |  |  |
Debt Instrument, Covenant, Senior Secured Leverage Ratio, Maximum |  |  | 1,916.7000 |  |  |  |  |
Senior Notes [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  |  | 6.375%
Loan balance, net of unamortized discount |  |  | $ 267,827,000 |  |  | 300,000,000 |  |
Senior Subordinated Notes [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Face amount of debt issued in connection with acquisition |  | $ 200,000,000 |  |  |  |  |  |
Senior subordinated notes implied rate |  | 7.00% |  |  |  |  |  |
Loan balance, net of unamortized discount |  |  | 0 |  |  | 187,973,000 |  |
Revolving Credit Facility [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Revolving Facility |  |  | $ 98,000,000 |  |  | $ 40,000,000 |  |
Amended and Restated Credit Agreement February 2015 [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Unused Borrowing Capacity, Amount |  |  |  | $ 205,000,000 |  |  |  |
Letters of Credit Outstanding, Amount |  |  |  | $ 7,900,000 |  |  |  |
Amended and Restated Credit Agreement February 2015 [Member] | Minimum [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage | 0.35% |  |  |  |  |  |  |
Amended and Restated Credit Agreement February 2015 [Member] | Maximum [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage | 0.70% |  |  |  |  |  |  |
Amended and Restated Credit Agreement February 2015 [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  |  |  | $ 400,000,000 |
Amended and Restated Credit Agreement February 2015 [Member] | Term Loan Facility [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | $ 40,000,000 |  |  |  |  |  |  |
Amended and Restated Credit Agreement July 2015 [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  | $ 375,000,000 |  |  |
Amended and Restated Credit Agreement July 2015 [Member] | Term Loan Facility [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  | $ 40,000,000 |  |  |
London Interbank Offered Rate (LIBOR) [Member] | Amended and Restated Credit Agreement February 2015 [Member] | Minimum [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate | 2.25% |  |  |  |  |  |  |
London Interbank Offered Rate (LIBOR) [Member] | Amended and Restated Credit Agreement February 2015 [Member] | Maximum [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate | 4.75% |  |  |  |  |  |  |

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