Income Taxes (Details) (USD $)	3 Months Ended
	Mar. 31, 2015	Sep. 30, 2012	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	11,200,000		10,000,000
Total unrecognized tax benefit	13,100,000		11,900,000
NOL and tax credit carryforwards	(4,700,000)		(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]
Earliest year subject to examination	2009
Year(s) under examination		2010 and 2011
Year of carryback claim under examination		2009
Potential Tax Adjustments	$ 12,000,000
State Jurisdiction (Colorado)
Tax Audits [Abstract]
Earliest year subject to examination	2009