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Warranty and Options Activity (Details) - Stock Options and Warrants - $ / shares
shares in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award, Options and Warrants, Outstanding [Roll Forward]      
Underlying Shares - Outstanding at beginning of year 103 758 1,052
Underlying Shares - Exercised 0 (655) (294)
Underlying Shares - Outstanding at end of year 103 103 758
Underlying Shares - Exercisable at end of year 23 13 663
Share-based Compensation Arrangement by Share-based Payment Award, Options and Warrants, Outstanding, Weighted Average Exercise Price [Roll Forward]      
Weighted-Average Exercise Price - Outstanding at beginning of year $ 37.34 $ 20.67 $ 19.90
Weighted-Average Exercise Price - Exercised 0.00 18.06 17.93
Weighted-Average Exercise Price - Outstanding at end of year 37.34 37.34 20.67
Weighted-Average Exercise Price - Exercisable at end of year $ 31.43 $ 24.57 $ 18.14