Share-Based Compensation - Summary of Activity for Non-Vested Awards Granted (Details) - USD ($) $ / shares in Units, $ in Thousands		12 Months Ended
	Nov. 03, 2016	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Performance shares legally granted that have not met the grant-date requirements required by GAAP (in shares)	192,024	192,024
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Number of shares at beginning of year		1,499,145	921,559	308,426
Number of shares granted (in shares)		1,128,522	1,046,362	738,164
Number of shares Vested and Settled		(894,900)	(303,166)	(30,898)
Number of shares forfeited		(322,557)	(165,610)	(94,133)
Number of shares at end of year		1,410,210	1,499,145	921,559	308,426
Number of non-vested shares expected to vest at end of year		1,287,348
Weighted average grant date fair value per share at beginning of year		$ 23.42	$ 30.42	$ 25.65
Weighted average grant date fair value per share, shares granted		3.28	17.62	32.46
Weighted average grant date fair value per share, shares vested and settled		8.88	24.31	29.45
Weighted average grant date fair value per share, shares forfeited		22.64	23.96	8.48
Weighted average grant date fair value per share at end of year		16.71	$ 23.42	$ 30.42	$ 25.65
Weighted average grant date fair value per share, Non-vested shares expected to vest at end of year		$ 16.46
Weighted average contractual term at end of year		4 years 8 months 6 days	1 year 10 months 16 days	1 year 10 months 2 days	1 year 10 months 24 days
Weighted average contractual term, Non-vested shares expected to vest		4 years 10 months 18 days
Aggregate intrinsic value, shares vested and settled		$ 4,217	$ 4,132	$ 910
Aggregate intrinsic value at end of year		6,698	$ 21,318	$ 15,215	$ 10,906
Aggregate intrinsic value, Non-vested shares expected to vest		$ 6,115