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Other Investments and Assets - Summary of Other Investments and Assets (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Investments All Other Investments [Abstract]    
Cash surrender value of life insurance $ 23,114 $ 23,197
Self-insured liability receivable 10,463 10,463
Workers’ compensation insurance security deposits 4,050 4,050
Other mutual funds 2,494 2,062
Other 7,609 4,525
Other investments and assets $ 47,730 $ 44,297