Stockholders' Equity (Narrative) (Details) - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Stockholders Equity Note [Abstract]
Shares remaining authorized for repurchase (in shares)	2,600
Stock repurchased (in shares)	900	2,400	500
Cost of stock repurchased	$ 23,801	$ 75,946	$ 30,000
RSU withholdings (in shares)	198	198	138
RSU withholdings	$ 5,090	$ 6,521	$ 8,065