Summary of Significant Accounting Policies (Details 4) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Accounting Policies [Abstract]
Net book value of intangible assets	$ 79,700,000	$ 86,900,000
Goodwill impairment charges	0	$ 0
Finite-Lived Intangible Assets [Line Items]
Net book value of finite-lived intangible assets	$ 43,100,000
Minimum
Finite-Lived Intangible Assets [Line Items]
Intangible assets with defined useful lives, amortization period	1 year
Maximum
Finite-Lived Intangible Assets [Line Items]
Intangible assets with defined useful lives, amortization period	20 years