Earnings Per Share - (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Numerator:
Net loss	$ (58,920)	$ (72,298)	$ (79,626)	$ (88,296)
Denominator:
Weighted average common shares outstanding	23,560	23,351	23,511	23,337
Effect of dilutive securities:
Outstanding common stock equivalents	0	0	0	0
Denominator for diluted earnings per share	23,560	23,351	23,511	23,337
Basic loss per share	$ (2.50)	$ (3.10)	$ (3.39)	$ (3.78)
Diluted loss per share	$ (2.50)	$ (3.10)	$ (3.39)	$ (3.78)
Excluded outstanding share-based awards having an anti-dilutive effect	368	630	368	630
Convertible Debt Securities
Effect of dilutive securities:
Excluded outstanding share-based awards having an anti-dilutive effect	0	1,024	0	1,332