Annual report pursuant to Section 13 and 15(d)

Goodwill (Details)

v3.3.1.900
Goodwill (Details) - USD ($)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Goodwill and Intangible Assets Disclosure [Abstract]      
Goodwill, Impairment Loss $ 0    
Goodwill [Roll Forward]      
Beginning of Period 527,502,000 $ 527,502,000  
Period activity   36,047,000 $ 0
Ending of Period $ 563,549,000 $ 527,502,000 $ 527,502,000