Annual and transition report of foreign private issuers pursuant to Section 13 or 15(d)

Goodwill and Other Intangible Assets (Schedule of Changes in the Carrying Amount of Goodwill) (Details)

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Goodwill and Other Intangible Assets (Schedule of Changes in the Carrying Amount of Goodwill) (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Goodwill and Other Intangible Assets [Abstract]      
Goodwill as of January 1 $ 1,195,891,000us-gaap_Goodwill $ 822,500,000us-gaap_Goodwill  
Goodwill impairment charges (102,470,000)us-gaap_GoodwillImpairmentLoss      
Goodwill acquired 233,300,000us-gaap_GoodwillAcquiredDuringPeriod 372,000,000us-gaap_GoodwillAcquiredDuringPeriod  
Translation differences (3,200,000)us-gaap_GoodwillTranslationAdjustments 1,400,000us-gaap_GoodwillTranslationAdjustments  
Goodwill as of December 31 $ 1,323,502,000us-gaap_Goodwill $ 1,195,891,000us-gaap_Goodwill $ 822,500,000us-gaap_Goodwill