Income Taxes (Gross Unrecognized Tax Benefits) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Reconciliation of Unrecognized Tax Benefits [Roll Forward]
Balance at beginning of period	$ 4,870	$ 3,466	$ 7,848
Additions based on tax positions related to prior years	348	1,230	453
Additions based on tax positions related to the current year	377	531	921
Reductions due to lapse of the applicable statute of limitations	(2,190)	(256)	(4,701)
Reductions due to lapse of the applicable statute of limitations	(1,818)	(101)	(1,055)
Balance at end of period	$ 1,587	$ 4,870	$ 3,466