Debt (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Debt including capital lease obligations
3.50% Senior Notes due September 15, 2022 (net of unamortized discount)	$ 498,165	$ 498,124
Term Loan Facility, interest rate of 1.78% and 1.81% at March 31, 2013 and December 31, 2012, respectively	390,000	395,000
Capital lease obligations and other borrowings	31,489	35,470
Debt and capital lease obligations	1,069,654	928,594
Less amounts due within one year	210,365	59,478
Total debt due after one year	859,289	869,116
Term Loan Facility [Member]
Debt Instrument [Line Items]
Interest rate (as a percent)	1.78%	1.81%
Senior Notes [Member]
Debt Instrument [Line Items]
Interest rate (as a percent)	3.50%	3.50%
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Interest rate (as a percent)	1.70%
Debt including capital lease obligations
Revolving Credit Facility, interest rate of 1.70% at March 31, 2013	$ 150,000	$ 0