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Debt And Liquidity (Narrative) (Details) |  |  | 6 Months Ended |  |
--- | --- | --- | --- | --- | ---
Feb. 27, 2015 USD ($) | Nov. 30, 2010 USD ($) | Jun. 30, 2015 USD ($) | Dec. 31, 2014 USD ($) | Nov. 20, 2012 USD ($)
Debt Instrument [Line Items] |  |  |  |  |
Fair value of debt |  |  | $ 520,400,000 | $ 473,300,000 |
Book value of debt |  |  | $ 548,600,000 | $ 529,700,000 |
Stated interest rate |  |  |  | 6.375% |
Interest rate used to record at present value |  |  | 7.00% |  |
Loan balance, net of unamortized discount |  |  | $ 199,215,000 | $ 188,104,000 |
Senior Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Principal amount issued |  |  |  |  | $ 300,000,000
Stated interest rate |  |  |  |  | 6.375%
Redemption price, percentage of principal, prior to November 15, 2016 |  |  |  |  | 100.00%
Redemption price, percentage of principal, prior to November 15, 2015 |  |  |  |  | 106.375%
Repurchase price, percentage of principal, due to change in control |  |  |  |  | 101.00%
Senior Notes | Minimum |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Unpaid indebtedness or accelerated proceeds exceeds |  |  | 50,000,000 |  |
Unpaid judgment or decree in excess of |  |  | 50,000,000 |  |
Senior Notes | Maximum |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Percentage of principal allowed to redeem |  |  |  |  | 35.00%
Senior Subordinated Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Face amount of debt issued in connection with acquisition |  | $ 200,000,000 |  |  |
Interest rate used to record at present value |  | 7.00% |  |  |
Amended and Restated Credit Agreement |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Unused borrowing capacity |  |  | 258,000,000 |  |
Outstanding letters of credit |  |  | $ 6,300,000 |  |
Minimum cash interest coverage ratio | 2.50 |  |  |  |
Range of maximum senior secured leverage ratio, minimum | 3.75 |  |  |  |
Range of maximum senior secured leverage ratio, maximum | 3.00 |  |  |  |
Amended and Restated Credit Agreement | Minimum |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Undrawn commitment fee | 0.35% |  |  |  |
Amended and Restated Credit Agreement | Maximum |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Undrawn commitment fee | 0.50% |  |  |  |
Amended and Restated Credit Agreement | LIBOR | Minimum |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Margin spread on variable interest rate | 2.25% |  |  |  |
Amended and Restated Credit Agreement | LIBOR | Maximum |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Margin spread on variable interest rate | 3.75% |  |  |  |
Term Loan Facility | Amended and Restated Credit Agreement |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Borrowing capacity | $ 40,000,000 |  |  |  |
Revolving Credit Facility | Amended and Restated Credit Agreement |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Borrowing capacity | $ 400,000,000 |  |  |  |

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