Basis of Presentation, Use of Accounting Estimates and Significant Accounting Policies (Narrative) (Details)		3 Months Ended				8 Months Ended		12 Months Ended			20 Months Ended	24 Months Ended
	Nov. 20, 2017 USD ($)	Dec. 31, 2017 USD ($)	Sep. 30, 2017 USD ($)	Jun. 30, 2017 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2015 USD ($)	Dec. 26, 2014 USD ($)	Dec. 31, 2017 USD ($) segment	Dec. 31, 2016 USD ($)	Apr. 24, 2015 USD ($)	Dec. 31, 2015 USD ($) segment	Dec. 31, 2017 USD ($)
Reclassifications [Line Items]
Impairment of discontinued operations, net of tax		$ 78,283,000	$ 0	$ 0	$ 0	$ 0		$ 78,283,000	$ 0	$ 0
Operating expenses						(262,241,000)	$ (111,170,000)	(555,950,000)	(528,063,000)	(175,595,000)
Assets held for sale		$ 13,628,000						13,628,000	4,477,000			$ 13,628,000
Proceeds from divestiture of businesses								4,900,000
Loans to cost and equity method investees								$ (7,426,000)	(6,270,000)	$ 0	$ 0
Number of operating segments | segment											1
Number of reportable Segments | segment								2
CRM Business Franchise [Member]
Reclassifications [Line Items]
Disposal group, including discontinued operation, consideration	$ 190,000,000
CRM Business Franchise [Member] | Discontinued Operations, Held-for-sale [Member]
Reclassifications [Line Items]
Impairment of discontinued operations, net of tax	78,300,000
Impairment of discontinued operations, tax benefit	$ 15,300,000
Adjustments [Member] | Neuromodulation [Member]
Reclassifications [Line Items]
Operating expenses						(1,000,000)			$ (6,000,000)
Adjustments [Member] | CRM Business Franchise [Member]
Reclassifications [Line Items]
Operating expenses						$ 1,000,000						$ 6,000,000