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Segment Reporting (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Segment Reporting Information [Line Items]        
Revenue $ 413,343 $ 390,122 $ 795,820 $ 750,325
Income from operations $ 88,303 83,219 $ 161,106 153,265
CAG/LPD Segment Transition [Member]        
Segment Reporting Information [Line Items]        
Revenue   $ 4,600   $ 7,400