General - Stock Compensation - Stock Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Stock Compensation
Stock compensation expense	$ 5,414	$ 10,439	$ 15,021	$ 18,085
Minimum
Stock Compensation
Estimated forfeitures (as a percent)	0.00%	0.00%	0.00%	0.00%
Maximum
Stock Compensation
Estimated forfeitures (as a percent)	4.00%	4.00%	4.00%	4.00%