Commitments and Contingencies (Details) - USD ($)		12 Months Ended
	Jul. 18, 2013	Dec. 31, 2015
Loss Contingencies [Line Items]
Toll charges and fees to remediate IRC Section 7702 issue		$ 13,400,000
Cost of claim and reserve liabilities to remediate IRC Section 7702 issue		1,200,000
Total costs to remediate IRC Section 7702 issue		14,600,000
Consulting fees to remediate IRC Section 7702 and 72(s) issue		2.0
Loss Contingency, Settlement Agreement, Date	July 18, 2013
Loss Contingency, Damages Awarded, Value	$ 183,000
IRC Section 7702 remediation costs [Member]
Loss Contingencies [Line Items]
Loss Contingency, Range of Possible Loss, Minimum		500,000
Loss Contingency, Range of Possible Loss, Maximum		1,500,000
Minimum [Member]
Loss Contingencies [Line Items]
Cost Range to Remediate IRC Section 7702 Issue		9,000,000
Maximum [Member]
Loss Contingencies [Line Items]
Cost Range to Remediate IRC Section 7702 Issue		$ 45,500,000