Income Taxes (Details 4) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Reconciliation of unrecognized tax benefits, excluding penalties and interest
Balance at the beginning of the period	$ 8,105	$ 9,013	$ 8,322
Increases during the year:
Gross increases - tax positions in prior period	1,401	433	644
Gross increases - current-period tax positions	700	656	1,355
Decreases during the year:
Gross decreases - tax positions in prior period	(308)	(192)	(71)
Decreases due to settlements with taxing authorities	(486)	(877)	(154)
Decreases due to lapse of statute of limitations	(964)	(928)	(1,083)
Balance at the end of the period	$ 8,448	$ 8,105	$ 9,013
Number of open tax years settled	3 years	6 years	4 years