Long-Term Debt - Additional Information (Details) - USD ($)		12 Months Ended
	Apr. 15, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Apr. 12, 2011
Debt Instrument [Line Items]
Senior secured notes	$ 150,000,000	$ 150,000,000	$ 150,000,000
Cash paid during the year for interest		$ 17,273,000	18,784,000	$ 26,492,000
Senior Secured Notes
Debt Instrument [Line Items]
Interest rate		8.75%
Extinguishment of debt, amount	$ 50,000,000
Percentage of principal amount redeemed	25.00%
Redemption price, percentage	106.563%
Decrease to debt instrument interest cost	$ 3,900,000
Interest expense on note		$ 13,100,000	14,300,000	$ 17,100,000
Cash paid during the year for interest		$ 13,100,000	$ 15,100,000
Debt Instrument, Redemption, Period Two [Member]
Debt Instrument [Line Items]
Extinguishment of debt, amount	5,000,000
Debt Instrument, Redemption, Period One [Member]
Debt Instrument [Line Items]
Extinguishment of debt, amount	$ 45,000,000
Private Placement | Senior Secured Notes
Debt Instrument [Line Items]
Private placement date		Apr. 12, 2011
Issuance of private placement, principal amount					$ 200,000,000.0
Interest rate					8.75%
Term of payments of interest on notes		semi-annually