Other Long-Term Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Other Liabilities Disclosure [Abstract]
Deferred compensation plan	$ 23,756	$ 22,425
Supplemental executive retirement plan	11,050	10,197
Other	4,427	3,834
Other long-term liabilities	$ 39,233	$ 36,456