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Other Long-Term Obligations (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Disclosure Other Long Term Obligations [Abstract]    
Long-term lease obligations, net of current portion $ 26,460 $ 23,152
Deferred compensation 5,023 7,219
Deferred proceeds 5,576 9,013
Other 6,216 2,392
Other long-term obligations $ 43,275 $ 41,776