Acquisitions (Schedule of Measurement Period Adjustments) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Measurement Period Adjustments [Line Items]
Current assets	$ 1,332,316	$ 1,049,641
Property and equipment, net	504,313	350,192
Goodwill	891,266	824,953
Other long-term assets, including disontinued operations	53,610	54,160
Current liabilties	882,229	713,793
Scenario, Previously Reported [Member]
Measurement Period Adjustments [Line Items]
Current assets		1,047,100
Property and equipment, net		350,400
Goodwill		820,300
Other long-term assets, including disontinued operations		53,100
Current liabilties		705,700
Scenario, Adjustment [Member] | 2012 Acquisitions [Member] | Purchase Price Allocation Adjustments [Member]
Measurement Period Adjustments [Line Items]
Current assets		2,500
Property and equipment, net		(200)
Goodwill		4,700
Other long-term assets, including disontinued operations		1,100
Current liabilties		$ 8,100