Other Investments and Assets - Summary of Other Investments and Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Investments All Other Investments [Abstract]
Cash surrender value of life insurance	$ 22,028	$ 21,970
Self-insured liability receivable	5,979	5,979
Workers’ compensation insurance security deposits	4,250	4,250
Other mutual funds	2,395	2,192
Other	3,752	3,240
Other investments and assets	$ 38,404	$ 37,631