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Segment Reporting (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Segment Reporting Information [Line Items]        
Revenue $ 406,387 $ 383,523 $ 1,202,207 $ 1,133,848
Income from operations 71,895 72,189 233,001 225,454
Impairment charge $ 8,212   $ 8,212  
CAG/LPD Segment Transition [Member]        
Segment Reporting Information [Line Items]        
Revenue   $ 3,400   $ 10,800