Income Taxes (Details) - USD ($)	1 Months Ended	9 Months Ended		12 Months Ended
	Feb. 29, 2016	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2012	Dec. 31, 2015
Unrecognized Tax Benefits [Abstract]
Unrecognized tax benefit - Permanent tax positions		$ 3,200,000			$ 2,600,000
Unrecognized tax benefit - Temporary tax positions		22,700,000			22,100,000
Total unrecognized tax benefit		25,900,000			24,700,000
NOL and tax credit carryforwards		(5,700,000)			(5,000,000)
Upper bound of decrease in unrecognized tax benefit that is reasonably possible		7,000,000
Amounts accrued for penalties related to unrecognized tax benefits		0			$ 0
Internal Revenue Service (IRS)
Tax Audits [Abstract]
Year(s) under examination			2012 and 2013	2010 and 2011
Year of carryback claim under examination				2009
Potential Tax Adjustments		$ 14,000,000
Earliest year subject to examination		2009
State Jurisdiction (Texas)
Tax Audits [Abstract]
Year(s) under examination	2009 and 2010
Earliest year subject to examination		2009