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Goodwill (Changes in Goodwill) (Details) (USD $)
6 Months Ended
Jun. 30, 2014
Goodwill [Roll Forward]  
Goodwill at beginning of period $ 221,087,000
Increase in goodwill related to acquisitions 33,826,000
Impairments and changes in previous estimates (1,323,000)
Reclassification of assets held-for-sale (17,000)
Goodwill at end of period 253,573,000
Goodwill, Impairment Loss 1,200,000
Goodwill, Purchase Accounting Adjustments $ (100,000)