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Stock Incentive Plans (Details Textual) - USD ($)
shares in Thousands, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Stock Incentive Plans [Line Items]        
Number of common stock authorized for 2016 Long-Term Incentive Plan 10,000   10,000  
Stock-based compensation expense $ 4,763 $ 7,031 $ 9,669 $ 15,217
Maximum [Member]        
Stock Incentive Plans [Line Items]        
Vesting period     5 years  
Minimum [Member]        
Stock Incentive Plans [Line Items]        
Vesting period     3 years  
Stock Incentive Plan [Member]        
Stock Incentive Plans [Line Items]        
Option expiration period     10 years