Other Liabilities (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Other Liabilities Disclosure [Abstract]
Reserve for potential uncertain income tax return positions	$ 3,020	$ 12,742	$ 5,925	$ 3,180
Unfavorable lease liability, long term portion	294	394
Portion of an unrecognized tax benefit netted against deferred tax asset for a net operating loss carryforward	(1,135)	(8,422)
Other	0	5
Total	$ 2,179	$ 4,719