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Fair Value Measurements - Schedule of Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - Fair Value, Measurements, Recurring [Member] - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Available-for-sale securities $ 52,614 $ 36,711
Total 33,664 21,218
Fair Value, Inputs, Level 1 [Member]    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Available-for-sale securities 52,614 36,711
Total 52,614 36,711
Fair Value, Inputs, Level 2 [Member]    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Total (18,950) (15,493)
Foreign currency forward contracts [Member]    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Derivative Assets (Liabilities) 486 (1,759)
Foreign currency forward contracts [Member] | Fair Value, Inputs, Level 2 [Member]    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Derivative Assets (Liabilities) 486 (1,759)
Interest Rate Swap [Member]    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Derivative Assets (Liabilities) (19,436) (13,734)
Interest Rate Swap [Member] | Fair Value, Inputs, Level 2 [Member]    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Derivative Assets (Liabilities) $ (19,436) $ (13,734)