Share-based Compensation and Equity - Summary of Stock Options Activity (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Options
Outstanding, of period (in shares)	9,020	9,903	10,928
Granted (in shares)	698	717	4,283
Exercised (in shares)	(1,569)	0	0
Forfeited or expired (in shares)	(2,761)	(1,600)	(5,308)
Outstanding, end of period (in shares)	5,388	9,020	9,903
Exercisable (in shares)	4,846	7,878	8,606
Vested and expected to vest (in shares)	5,274	8,990	9,847
Weighted Average Exercise Price
Outstanding, beginning of period (in dollars per share)	$ 18.79	$ 19.30	$ 21.81
Granted (in dollars per share)	14.99	14.27	19.01
Exercised (in dollars per share)	16.95	0	0
Forfeited or expired (in dollars per share)	20.06	19.92	18.34
Outstanding, end of period (in dollars per share)	18.18	18.79	19.30
Exercisable (in dollars per share)	18.50	19.11	19.38
Vested and expected to vest (in dollars per share)	$ 18.20	$ 18.80	$ 19.31
Aggregate Intrinsic Value
Outstanding, beginning of period	$ 744	$ 0	$ 4,350
Exercised	794	0	0
Outstanding, end of period	3,396	744	0
Exercisable intrinsic value	2,136	265	0
Vested and expected to vest, intrinsic value	$ 3,344	$ 722	$ 0