Long-term Debt - Pro Forma Impact of Bond Exchange Program (Details) - USD ($) $ in Thousands	Apr. 28, 2016	Mar. 31, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Aggregate principal amount of debt		$ 181,343	$ 182,992
Senior notes [Member]
Debt Instrument [Line Items]
Aggregate principal amount of debt		175,000	$ 175,000
Senior secured second-priority notes (maturing December 15, 2021) [Member] | Senior notes [Member]
Debt Instrument [Line Items]
Aggregate principal amount of debt		175,000
Senior secured third-priority notes (maturing May 15, 2018) [Member] | Senior notes [Member]
Debt Instrument [Line Items]
Aggregate principal amount of debt		$ 0
Subsequent event [Member] | Senior notes [Member]
Debt Instrument [Line Items]
Aggregate principal amount of debt	$ 149,066
Subsequent event [Member] | Senior secured second-priority notes (maturing December 15, 2021) [Member] | Senior notes [Member]
Debt Instrument [Line Items]
Aggregate principal amount of debt	120,569
Subsequent event [Member] | Senior secured third-priority notes (maturing May 15, 2018) [Member] | Senior notes [Member]
Debt Instrument [Line Items]
Aggregate principal amount of debt	$ 28,497