Employee Termination Benefits (Details) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Employee Termination Benefits
Cash	$ 23	$ 0	$ 19,522	$ 2,990
Share-Based Compensation	$ 0	$ 0	$ 13,131	$ 1,825
Number of Shares	0	0	763	96
Total Employee Termination Benefits	$ 23	$ 0	$ 32,653	$ 4,815
Executive Employee Termination Benefits
Employee Termination Benefits
Cash	0	0	11,945	2,500
Share-Based Compensation	$ 0	$ 0	$ 9,196	$ 1,825
Number of Shares	0	0	554	96
Total Employee Termination Benefits	$ 0	$ 0	$ 21,141	$ 4,325
Other Employee Termination Benefits
Employee Termination Benefits
Cash	23	0	7,577	490
Share-Based Compensation	$ 0	$ 0	$ 3,935	$ 0
Number of Shares	0	0	209	0
Total Employee Termination Benefits	$ 23	$ 0	$ 11,512	$ 490