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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Oct. 01, 2016
Statement of Financial Position [Abstract]      
Accumulated depreciation $ 387,041 $ 345,907 $ 333,660
Preferred stock; par value (USD per share) $ 0.01 $ 0.01 $ 0.01
Preferred stock; shares authorized 100,000 100,000 100,000
Preferred stock; issued 0 0 0
Preferred stock; outstanding 0 0 0
Common stock, voting; par value (USD per share) $ 0.01 $ 0.01 $ 0.01
Common stock, voting; shares authorized 150,000,000 150,000,000 150,000,000
Common stock voting; shares issued 47,419,316 48,948,670 49,625,609
Common stock voting; shares outstanding 47,419,316 48,948,670 49,625,609