Quarterly report pursuant to Section 13 or 15(d)

Derivative Financial Instruments - Gain (Loss) on Derivatives (Details)

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Derivative Financial Instruments - Gain (Loss) on Derivatives (Details) - Cash flow hedges - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Swap agreements, net of tax        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (Loss) Recognized in OCI $ (1,081)   $ (1,666)  
Gain (Loss) Recognized in OCI   $ 109   $ 367
Foreign currency forward contracts, net of tax        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (Loss) Recognized in OCI 90   90  
Gain (Loss) Recognized in OCI   0   0
Interest expense and other | Swap agreements, net of tax        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain Recognized in Income 212   433  
Gain Recognized in Income   145   244
Cost of revenue and operating expenses | Foreign currency forward contracts, net of tax        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain Recognized in Income $ 11   $ 11  
Gain Recognized in Income   $ 0   $ 0