Stockholders' Equity (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Jul. 19, 2019
Stockholders Equity Note [Abstract]
Shares remaining authorized for repurchase (in shares)	3,600,000
Stock repurchased (in shares)	2,400,000	500,000	2,400,000
Cost of stock repurchased	$ 75,946	$ 30,000	$ 113,161
Number of shares authorized to be repurchased				4,500,000
RSU withholdings (in shares)	198,000	138,000	135,000
RSU withholdings	$ 6,521	$ 8,065	$ 6,415