Long-Term Debt (Tables)

6 Months Ended

Jun. 30, 2017

Debt Instrument [Line Items]

Schedule of Debt [Table Text Block]

The United States dollar-denominated and the British pound-denominated term loans began to amortize in quarterly installments during the three months ended September 30, 2016, with the remaining principal balance payable upon maturity, as set forth below (amounts in thousands):

	Quarterly Payment Date	Principal Amount Due on Each Payment Date
British pound:	September 30, 2017 through June 30, 2018	£	1,271
	September 30, 2018 through December 31, 2019	£	2,542
	Maturity date - March 31, 2020	£	75,532

Schedule of Line of Credit Facilities [Table Text Block]

The Company's availability to draw from the unused borrowing capacity is subject to covenant limitations as discussed below. As of June 30, 2017, the Company had the following unused borrowing capacity under its revolving credit facility (dollars in thousands):

	2017
Total available borrowing capacity	$	625,000
Outstanding revolving loans	$	222,122
Outstanding letter of credit guarantees	$	2,672
Unused borrowing capacity	$	400,206

Credit agreement [Member]

Debt Instrument [Line Items]

Schedule of Debt [Table Text Block]

As of June 30, 2017, the Company had the following outstanding term loans under its Credit Agreement (amounts in thousands, except percentages):

	Local Currency		United States Dollar Equivalent		Interest Rate
United States dollar	$	1,323,000	$	1,323,000	2.98	%
British pound	£	95,868	$	124,696	2.00	%

Line of Credit [Member]

Debt Instrument [Line Items]

Schedule of Debt [Table Text Block]

As of June 30, 2017, the Company had the following outstanding revolving loans under its revolving credit facility (amounts in thousands, except percentages):

	Local Currency		United States Dollar Equivalent		Interest Rate
British pound (swingline loan)	£	4,000	$	5,203	1.97	%
British pound	£	135,000	$	175,595	2.00	%
Canadian dollar	C$	7,500	$	5,774	2.66	%
Euro	€	31,150	$	35,551	1.75	%