Income Taxes (Reconciliation of Gross Unrecognized Tax Benefit) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Reconciliation of gross unrecognized tax benefits
Gross unrecognized tax benefit balance at beginning of year	$ 7,636	$ 5,459	$ 4,023
Change in tax positions of prior years	(3,073)	426	182
Change in tax positions of current year	169	2,929	1,254
Reduction in tax positions for statute expirations	(1,120)	(1,178)
Gross unrecognized tax benefit balance at end of year	$ 3,612	$ 7,636	$ 5,459