Reconciliation of Total Amounts of Unrecognized Tax Benefits (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Beginning balance of unrecognized tax benefits	$ 6,274	$ 7,074	$ 7,554
Additions based on tax positions related to the current year	752	1,180	508
Additions for tax positions of prior years	78	2,601	1,475
Reductions for tax positions of prior years	(626)	(2,404)	(1,888)
Reductions to tax positions resulting from a lapse of the applicable statute of limitations	(226)	(2,177)	(575)
Settlements with taxation authorities	(762)
Ending balance of unrecognized tax benefits	$ 5,490	$ 6,274	$ 7,074