Discontinued Operations, Assets of Businesses Held for Sale & Sales of Businesses - Assets of Businesses Held for Sale (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Assets:
Intangible assets, net of accumulated amortization	$ 8,200	$ 26,000
Total assets of businesses held for sale	8,200	26,000
Disposal Group, Held-for-sale
Assets:
Intangible assets, net of accumulated amortization	8,194	25,999
Total assets of businesses held for sale	$ 8,194	$ 25,999