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Stock Incentive Plans (Details Textual) - USD ($)
shares in Thousands, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Stock Incentive Plans [Line Items]        
Number of common stock authorized for Long-Term Incentive Plan 10,000   10,000  
Stock-based compensation expense $ 5,401 $ 5,477 $ 20,618 $ 25,655
Maximum [Member]        
Stock Incentive Plans [Line Items]        
Vesting period     5 years  
Minimum [Member]        
Stock Incentive Plans [Line Items]        
Vesting period     3 years  
Employee Stock Option [Member] | Employee Stock Option [Member] | Officer [Member]        
Stock Incentive Plans [Line Items]        
Vesting period     10 years