Income Taxes (Details) - USD ($)	3 Months Ended	6 Months Ended
	Sep. 30, 2012	Jun. 30, 2015	Dec. 31, 2014
Unrecognized Tax Benefits [Abstract]
Unrecognized tax benefit - Permanent tax positions		$ 1,600,000	$ 1,500,000
Unrecognized tax benefit - Temporary tax positions		12,600,000	11,700,000
Total unrecognized tax benefit		14,200,000	13,200,000
NOL and tax credit carryforwards		(6,000,000)	$ (4,800,000)
Upper bound of decrease in unrecognized tax benefit that is reasonably possible		2,000,000
Amounts accrued for penalties related to unrecognized tax benefits		$ 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 (Texas)
Tax Audits [Abstract]
Earliest year subject to examination		2009