Stockholders' Equity Shareholders' Equity (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Stockholders' Equity Attributable to Parent [Abstract]
Stock Repurchased and Retired During Period, Value	$ 154,516	$ 306,393	$ 99,677
Stock Repurchased and Retired During Period, Shares	3,987,945	5,849,234	2,081,227
Stock Repurchase and Retired During Period, Weighted Average Price	$ 38.75	$ 52.38	$ 47.89