Debt (Details Textual) (USD $)	9 Months Ended			6 Months Ended	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014 2012 Credit Agreement Revolving Loan	Jun. 30, 2014 2010 Convertible Notes	Sep. 30, 2014 2010 Convertible Notes
Debt Disclosure [Abstract]
Cash used for repayment of debt	$ 11,250,000	$ 11,250,000
Amount available under revolving loan facility			100,000,000
Conversion obligation settlement in cash					100.00%
Initial conversion rate of common stock				42.1363	42.3766
Convertible Notes, initial conversion of Par Value Convertible Notes to common stock				$ 1,000	$ 1,000
Initial conversion price				$ 23.73	$ 23.60
Common stock price trigger				$ 30.85	$ 30.68
Rate of conversion price				130.00%	130.00%