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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
$ in Thousands
Apr. 01, 2017
Dec. 31, 2016
Apr. 02, 2016
Statement of Financial Position [Abstract]      
Accumulated depreciation $ 365,733 $ 345,907 $ 307,449
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 48,517,417 48,948,670 51,206,395
Common stock voting; shares outstanding 48,517,417 48,948,670 51,206,395