Acquisitions (Schedule of Measurement Period Adjustments) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Measurement Period Adjustments [Line Items]
Current assets	$ 1,357,936	$ 1,306,223
Goodwill	912,885	900,454
Current liabilties	820,389	826,746
Long-term deferred tax liabilities, net	154,151	155,012
As Previously Reported [Member]
Measurement Period Adjustments [Line Items]
Current assets		1,306,000
Goodwill		899,400
Current liabilties		825,500
Long-term deferred tax liabilities, net		154,900
Adjustments [Member] | Measurement Period Adjustments [Member] | 2013 Acquisitions [Member]
Measurement Period Adjustments [Line Items]
Current assets		200
Goodwill		1,100
Current liabilties		1,200
Long-term deferred tax liabilities, net		$ 100