Legal Proceedings (Details Textual) (USD $)	0 Months Ended		3 Months Ended
	Jan. 06, 2015	Apr. 19, 2013 shareholder_class_action	Jun. 30, 2013 shareholder_class_action	Dec. 31, 2014	Mar. 31, 2015	Jun. 10, 2013 shareholder_class_action	May 07, 2013 shareholder_class_action
Plaintiffs that have Separately Sought Damages
Loss Contingencies [Line Items]
Amount plaintiffs requested in fees	$ 300,000
Securities Class Action Settlement
Loss Contingencies [Line Items]
Number of shareholder class actions filed		4
Accrued liability for low end of range in amount				3,300,000
Federal Shareholder Derivative Settlement
Loss Contingencies [Line Items]
Number of shareholder class actions filed			2
Accrued liability for low end of range in amount					400,000
Number of actions						2
Number of plaintiffs	3
Amount plaintiffs requested in fees	1,300,000
Amounts of settlement, minimum					400,000
Amounts of settlement, maximum					1,300,000.0
Insurance receivable from carrier					400,000
Federal Shareholder Derivative Settlement | Plaintiffs that have Separately Sought Damages
Loss Contingencies [Line Items]
Number of plaintiffs	1
Federal Shareholder Derivative Settlement | Minimum
Loss Contingencies [Line Items]
Range of value of case	400,000
Federal Shareholder Derivative Settlement | Maximum
Loss Contingencies [Line Items]
Range of value of case	$ 450,000
State Shareholder Derivative Matter
Loss Contingencies [Line Items]
Number of shareholder class actions filed			2
Number of actions							2