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Long-Term Debt (Tables)
 6 Months Ended
Jun. 30, 2016
Line of Credit [Member]  
Debt Instrument [Line Items]  
Schedule of Debt [Table Text Block]
As of June 30, 2016, the Company had the following unused borrowing capacity under its revolving credit facility (amounts in thousands):
 
 
June 30, 2016
Total available borrowing capacity
 
$
625,000

Less: Outstanding revolving loans
 
77,698

Less: Outstanding letter of credit guarantees
 
4,846

Total unused borrowing capacity
 
$
542,456

As of June 30, 2016, the Company had the following outstanding revolving loans (amounts in thousands, except percentages):
 
 
Local Currency
 
United States Dollar Equivalent
 
Interest Rate
British pound (swingline loan)
 
£
3,000

 
$
3,980

 
2.48
%
British pound
 
£
31,000

 
$
41,131

 
2.51
%
Canadian dollar
 
C$
17,000

 
$
13,099

 
2.87
%
Euro
 
€
17,600

 
$
19,489

 
2.00
%
Loans Payable [Member]  
Debt Instrument [Line Items]  
Schedule of Debt [Table Text Block]
As of June 30, 2016, the Company had the following outstanding term loans (amounts in thousands, except percentages):
 
 
Local Currency
 
United States Dollar Equivalent
 
Interest Rate
United States dollar
 
$
1,670,000

 
$
1,670,000

 
2.46
%
Australian dollar
 
A$
273,627

 
$
203,770

 
3.89
%
British pound
 
£
101,681

 
$
134,911

 
2.51
%