Income Taxes (Details) - USD ($)	3 Months Ended	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2015	Dec. 31, 2014
Unrecognized Tax Benefits [Abstract]
Unrecognized tax benefit — Permanent tax positions		$ 1,900,000	$ 1,900,000
Unrecognized tax benefit — Temporary tax positions		13,800,000	10,000,000
Total unrecognized tax benefit		15,700,000	11,900,000
NOL and tax credit carryforwards		(6,500,000)	(3,900,000)
Upper bound of decrease in unrecognized tax benefit that is reasonably possible		1,000,000
Amounts accrued for penalties related to unrecognized tax benefits		$ 0	$ 0
Internal Revenue Service (IRS)
Tax Audits [Abstract]
Year(s) under examination	2010 and 2011	2012 and 2013
Year of carryback claim under examination	2009
Potential Tax Adjustments		$ 13,000,000
State Jurisdiction (Colorado)
Tax Audits [Abstract]
Earliest year subject to examination		2009