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Acquisitions (Purchase Price Allocation) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Jul. 02, 2013
2013 Acquisitions [Member]
Business Acquisition [Line Items]        
Current assets, net of cash acquired       $ 60,669
Property and equipment       4,545
Intangible assets (primarily customer relationships)       59,242
Non-tax-deductible goodwill 802,318 695,799 600,827 100,257
Current liabilities       (17,619)
Long term liabilities       (7,879)
Deferred tax liabilities       (20,108)
Net assets acquired       $ 179,107