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Other Investments and Assets - Summary of Other Investments and Assets (Details) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Investments, All Other Investments [Abstract]    
Cash surrender value of life insurance $ 20,994 $ 20,866
Self-insured liability receivable 7,728 7,728
Workers’ compensation insurance security deposits 4,250 4,250
Other mutual funds 2,162 2,536
Other 4,656 5,294
Other investments and assets $ 39,790 $ 40,674