Stockholders' Equity Share Repurchases (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Feb. 27, 2018
Equity, Class of Treasury Stock [Line Items]
Incremental Common Shares Attributable to Dilutive Effect of Conversion of Debt Securities	0	1,640,477	799,680
Treasury Stock, Value, Acquired, Cost Method	$ 70,876	$ 175,000	$ 0
Share Repurchase Plan [Member]
Equity, Class of Treasury Stock [Line Items]
Treasury Stock, Value, Acquired, Cost Method	$ 70,900	$ 175,000
Stock Repurchase Program, Authorized Amount				$ 375,000
Stock Repurchase Program, Number of Shares Authorized to be Repurchased				10,000,000.0