Stockholders' Equity (Narrative) (Details) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2019	Jul. 01, 2018	Jul. 19, 2019
Stockholders' Equity Note [Abstract]
Shares remaining authorized for repurchase (in shares)	500		500
Stock repurchased (in shares)			1,000
Cost of stock repurchased	$ 16,980	$ 15,000	$ 32,000
Common stock repurchased to help administratively facilitate the withholding and subsequent remittance of personal income and payroll taxes for individuals receiving RSUs (in shares)			200	100
Cost of common stock repurchased to help administratively facilitate the withholding and subsequent remittance of personal income and payroll taxes for individuals receiving RSUs			$ 5,658	$ 7,168
Subsequent Event [Member]
Subsequent Event [Line Items]
Number of Shares Authorized to be Repurchased					4,500