Acquisitions (Schedule of Measurement Period Adjustments, Business Acquisitions) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Measurement Period Adjustments [Line Items]
Current assets	$ 1,573,952	$ 1,307,026
Goodwill	1,000,024	902,044
Current liabilties	910,874	829,225
Long-term deferred tax liabilities, net	180,449	154,763
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
Measurement Period Adjustments [Member] | 2013 Acquisitions [Member]
Measurement Period Adjustments [Line Items]
Current assets		1,000
Goodwill		2,600
Current liabilties		3,700
Long-term deferred tax liabilities, net		$ (100)