Other Long-Term Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Other Liabilities Disclosure [Abstract]
Deferred compensation plan	$ 24,720	$ 24,238
Supplemental executive retirement plan	12,218	11,337
Other	4,887	5,051
Other long-term liabilities	$ 41,825	$ 40,626