Stockholders' Equity - Summary of Restricted Stock and Restricted Stock Units Activity (Details) - Restricted Stock and Restricted Stock Units - $ / shares	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Number of Shares
Beginning balance (in shares)	293,419	360,769	190,761
Shares granted	336,434	127,469	272,550
Vested shares	(152,714)	(164,144)	(87,445)
Shares forfeited	(39,168)	(30,675)	(15,097)
Ending balance (in shares)	437,971.000	293,419	360,769
Weighted Average Grant Price and Fair Value
Beginning balance (in dollars per share)	$ 35.86	$ 37.03	$ 38.61
Shares granted (in dollars per share)	16.34	35.15	36.73
Vested shares (in dollars per share)	35.83	37.85	38.69
Shares forfeited (in dollars per share)	25.46	36.76	41.64
Ending balance (in dollars per share)	$ 21.54	$ 35.86	$ 37.03