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Capital Stock and Share-Based Compensation - Stock Options Outstanding, Exercisable and Expected to Vest (Details) - 2010 Incentive Award Plan - Stock Options
$ / shares in Units, shares in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2017
USD ($)
$ / shares
shares
Number of Shares  
Stock options outstanding | shares 103
Stock options exercisable | shares 34
Stock options expected to vest | shares 103
Weighted Average Exercise Price  
Stock options outstanding | $ / shares $ 14.13
Stock options exercisable | $ / shares 14.13
Stock options expected to vest | $ / shares $ 14.13
Weighted Average Remaining Contractual Term (years)  
Stock options outstanding 8 years 3 months
Stock options exercisable 8 years 3 months
Stock options expected to vest 8 years 3 months
Aggregate Intrinsic Value  
Stock options outstanding | $ $ 3,690
Stock options exercisable | $ 1,230
Stock options expected to vest | $ $ 3,690