Debt (Schedule of Debt) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Debt including capital lease obligations
Term Loan Facility	$ 350,000	$ 370,000
Capital lease obligations and other borrowings	42,513	33,393
Debt and capital lease obligations	1,189,559	1,200,297
Less amounts due within one year	65,698	72,678
Total debt due after one year	1,123,861	1,127,619
2023 Senior notes [Member]
Debt Instrument [Line Items]
Long-term Debt	298,673	298,615
Debt including capital lease obligations
Stated interest rate (as a percent)	4.00%	4.00%
Term Loan Facility [Member]
Debt including capital lease obligations
Effective interest rate (as a percent)	1.48%	1.50%
2022 Senior notes [Member]
Debt Instrument [Line Items]
Long-term Debt	$ 498,373	$ 498,289
Debt including capital lease obligations
Stated interest rate (as a percent)	3.50%	3.50%