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		$ 200,000	$ 100,000
Unrecognized tax benefit — Temporary tax positions		2,400,000	2,900,000
Total unrecognized tax benefit		2,600,000	3,000,000
NOL and tax credit carryforwards		(700,000)	(900,000)
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 (Wisconsin)
Tax Audits [Abstract]
Earliest year subject to examination		2010