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Common Shares and Share-based Compensation - Stock Options Outstanding, Exercisable and Expected to Vest (Details) - Amended and Restated 2010 Incentive Plan - Stock Options
$ / shares in Units, shares in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2019
USD ($)
$ / shares
shares
Number of Shares  
Stock options outstanding | shares 73
Stock options exercisable | shares 73
Weighted Average Exercise Price  
Stock options outstanding | $ / shares $ 14.13
Stock options exercisable | $ / shares $ 14.13
Weighted Average Remaining Contractual Term (years)  
Stock options outstanding 6 years 3 months
Stock options exercisable 6 years 3 months
Aggregate Intrinsic Value  
Stock options outstanding | $ $ 5,407 [1]
Stock options exercisable | $ $ 5,407 [1]
[1] The aggregate intrinsic value is calculated as the difference between the closing market price of $88.44 per share of the Company’s common stock on December 31, 2019 and the exercise price of the stock options.