Income Taxes - Additional Information (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Effective income tax rates	1.30%	0.00%	3.00%	9.00%
Estimated useful life for amortization of tax expense			30 years
Prepaid tax asset, net of amortization	$ 170,000,000		$ 170,000,000		$ 109,400,000
Unrecognized tax benefits	$ 1,500,000		1,500,000		0
Interest and penalties accrued for any uncertain tax position					$ 0
Penalties for uncertain tax positions			200,000
Interest for uncertain tax positions			$ 100,000