Income Taxes (Details Textual) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Operating Loss Carryforwards [Line Items]
Valuation Allowance, Deferred Tax Asset, Change in Amount	$ 1,000,000
Income Taxes (Textual) [Abstract]
Portion of unrecognized tax benefit that, if recognized, would impact the effective tax rate	2,200,000
Excess tax benefits recognized related to employee stock option exercises and vested restricted stock awards	600,000	500,000
Consolidated income (loss) subject to tax	46,600,000	19,000,000	5,000,000
Cash paid for income taxes	600,000	1,100,000	1,200,000
Operating loss carryforwards	150,800,000
Net operating losses generated during period	15,800,000
Net deferred tax asset related to tax credit carryforwards	13,400,000
Net deferred tax asset related to credits	$ 12,900,000
Minimum [Member]
Operating Loss Carryforwards [Line Items]
Expiration years of net operating loss carryforwards	Jan. 01, 2027
Tax Credit Carryforward, Expiration Date	Jan. 01, 2017
Maximum [Member]
Operating Loss Carryforwards [Line Items]
Expiration years of net operating loss carryforwards	Jan. 01, 2032
Tax Credit Carryforward, Expiration Date	Jan. 01, 2032