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Share-Based Compensation - Stock Options Outstanding and Exercisable (Details)
$ / shares in Units, shares in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2017
USD ($)
$ / shares
shares
Options Outstanding  
Total Options Outstanding (in shares) | shares 2,130
Options Exercisable  
Number Exercisable (in shares) | shares 2,130
Aggregate Intrinsic Value  
Options Outstanding (in dollars) | $ $ 21,374
Options Exercisable (in dollars) | $ $ 21,374
$10.00-$11.54  
Options Outstanding  
Total Options Outstanding (in shares) | shares 35
Weighted Average Remaining Life (Years) 1 year 1 month 6 days
Weighted Average Exercise Price (in dollars per share) $ 10.54
Options Exercisable  
Number Exercisable (in shares) | shares 35
Weighted Average Exercise Price (in dollars per share) $ 10.54
Aggregate Intrinsic Value  
Range of Exercise Prices, Lower Limit (in dollars per share) 10.00
Range of Exercise Prices, Upper Limit (in dollars per share) $ 11.54
$13.46-$22.35  
Options Outstanding  
Total Options Outstanding (in shares) | shares 2,095
Weighted Average Remaining Life (Years) 1 year 8 months 12 days
Weighted Average Exercise Price (in dollars per share) $ 13.48
Options Exercisable  
Number Exercisable (in shares) | shares 2,095
Weighted Average Exercise Price (in dollars per share) $ 13.48
Aggregate Intrinsic Value  
Range of Exercise Prices, Lower Limit (in dollars per share) 13.46
Range of Exercise Prices, Upper Limit (in dollars per share) $ 22.35