Quarterly report pursuant to Section 13 or 15(d)

Intangible Assets - Definite Life Intangible Assets (Details)

v3.8.0.1
Intangible Assets - Definite Life Intangible Assets (Details) - USD ($)
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]    
Amortization of intangible assets $ 5,862,000 $ 11,528,000
Retired    
Definite life intangible assets:    
Intangible assets $ 390,043,000 $ 0