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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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