Acquisitions (Schedule of Business Acquisition Measurement Period Adjustments) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Measurement Period Adjustments [Line Items]
Current assets	$ 1,489,652	$ 1,307,026
Goodwill	983,133	902,044
Current liabilties	868,474	829,225
Long-term deferred tax liabilities, net	186,538	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
Adjustments [Member] | 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)