Net Loss Per Share (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Numerator:
Net loss	$ (92,178)	$ (49,444)
Denominator:
Average number of common shares outstanding, Basic	62,601,000	62,599,000
Average number of common shares outstanding, diluted	62,601,000	62,599,000
Net loss per share (in dollars per share)	$ (1.47)	$ (0.79)
Net loss per share (in dollars per share)	$ (1.47)	$ (0.79)
Effect of dilutive securities (in shares)	0	0
Anti-dilutive securities excluded from earnings per share calculation	1,012,919	357,333
Share-based awards exercised or released
Stock options exercised	9,641	24,831
Restricted stock units vested	35,703	16,873
Total	45,344	41,704