Intangible Assets (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]
Intangible asset impairment	$ 0	$ 0	$ 0
Amortization expense	14,000,000	$ 14,200,000	$ 14,000,000
2017 Through 2021 [Member]
Finite-Lived Intangible Assets [Line Items]
Amortization expense	$ 14,000,000