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Goodwill (Changes In The Carrying Amount Of Goodwill By Geographic Reporting Unit) (Details) - USD ($)
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Goodwill [Line Items]      
Balance at beginning of period $ 589,537,000 $ 370,066,000  
Acquisitions and adjustments 55,262,000 235,897,000  
Impairment of goodwill (443,659,000) 0 $ 0
Effect of foreign currency exchange rates (13,265,000) (16,426,000)  
Balance at end of period 187,875,000 589,537,000 370,066,000
Americas [Member]      
Goodwill [Line Items]      
Balance at beginning of period 339,411,000 264,735,000  
Acquisitions and adjustments 47,452,000 72,872,000  
Impairment of goodwill (382,271,000)    
Effect of foreign currency exchange rates (4,592,000) 1,804,000  
Balance at end of period   339,411,000 264,735,000
EMEA [Member]      
Goodwill [Line Items]      
Balance at beginning of period 216,942,000 71,155,000  
Acquisitions and adjustments 2,602,000 163,025,000  
Impairment of goodwill (61,388,000)    
Effect of foreign currency exchange rates (7,635,000) (17,238,000)  
Balance at end of period 150,521,000 216,942,000 71,155,000
Asia Pacific [Member]      
Goodwill [Line Items]      
Balance at beginning of period 33,184,000 34,176,000  
Acquisitions and adjustments 5,208,000    
Effect of foreign currency exchange rates (1,038,000) (992,000)  
Balance at end of period $ 37,354,000 $ 33,184,000 $ 34,176,000