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Debt (Narrative) (Details) |  | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Nov. 30, 2013 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Dec. 12, 2016 USD ($) | Dec. 11, 2016 USD ($) | Feb. 25, 2016 USD ($) | Oct. 31, 2013 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Proceeds from issuance of senior debt |  | $ 0 |  |  |  |  |  |
Debt instrument, carrying value |  | 396,871,000 | $ 396,269,000 |  |  |  |  |
Amount of letters of credit |  | 17,000,000 |  |  |  |  |  |
Amortization of deferred loan costs |  | 1,900,000 | 2,600,000 | $ 2,600,000 |  |  |  |
Deferred loan costs written off |  | 2,978,000 | 0 | $ 0 |  |  |  |
Senior unsecured notes due October 2021 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt, face amount | $ 100,000,000.0 |  |  |  |  |  |  | $ 300,000,000.0
Debt instrument, stated interest rate |  |  |  |  |  |  |  | 6.25%
Debt instrument, issuance price of par, percentage | 103.25% |  |  |  |  |  |  |
Proceeds from issuance of senior debt | $ 394,000,000 |  |  |  |  |  |  |
Debt instrument, carrying value |  | $ 400,000,000 | 400,000,000 |  |  |  |  |
Senior unsecured notes due October 2021 | Debt Instrument, Redemption, Period One |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Redemption price percentage |  | 104.688% |  |  |  |  |  |
Senior unsecured notes due October 2021 | Debt Instrument, Redemption, Period Two |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Redemption price percentage |  | 103.125% |  |  |  |  |  |
Senior unsecured notes due October 2021 | Debt Instrument, Redemption, Period Three |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Redemption price percentage |  | 101.563% |  |  |  |  |  |
Senior unsecured notes due October 2021 | Debt Instrument, Redemption, Period Four |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Redemption price percentage |  | 100.00% |  |  |  |  |  |
Senior secured revolving credit facility |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument, carrying value |  | $ 0 | $ 0 |  |  |  |  |
Remaining borrowing capacity |  | 103,700,000 |  |  |  |  |  |
Additional borrowing capacity |  | $ 150,000,000.0 |  |  |  |  |  |
Senior secured revolving credit facility | Revolving Credit Facility |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  | $ 140,000,000.0 | $ 600,000,000.0 | $ 200,000,000.0 |
Weighted average interest rates |  | 3.00% | 2.00% |  |  |  |  |
Senior secured revolving credit facility | Letter of Credit |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Maximum borrowing capacity |  | $ 25,000,000.0 |  |  |  |  |  |
Senior secured revolving credit facility | Swingline Loan |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Maximum borrowing capacity |  | $ 10,000,000.0 |  |  |  |  |  |
Senior secured revolving credit facility | Debt Instrument, Redemption, Period One |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Senior secured debt to adjusted EBITDA ratio |  | 4.50 |  |  |  |  |  |
Minimum leverage ratio |  | 1.0 |  |  |  |  |  |
Senior secured revolving credit facility | Debt Instrument, Redemption, Period Three |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Senior secured debt to adjusted EBITDA ratio |  | 3.50 |  |  |  |  |  |
Minimum leverage ratio |  | 1.0 |  |  |  |  |  |
Maximum |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Springing fixed charge coverage ratio |  | 1.25 |  |  |  |  |  |
Minimum |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Springing fixed charge coverage ratio |  | 1.0 |  |  |  |  |  |

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