Shareholders' Equity (Details) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Preferred Shares [Abstract]
Preferred shares, shares authorized (in shares)	2,000,000		2,000,000
Series A Convertible Preferred shares outstanding (in shares)	70,000		70,000
Common Shares [Abstract]
Common shares, authorized (in shares)	125,000,000		125,000,000
Common shares, par value (in dollars per share)	$ 0		$ 0
Common shares, shares issued (in shares)	83,210,775		83,121,698
Common shares, shares outstanding (in shares)	78,316,833		78,227,756
Treasury stock (in shares)	4,893,942		4,893,942
Stock options granted (in shares)	440,000	1,205,000
Options exercised (in shares)	89,077
Warrants exercised (in shares)	0
Series A Preferred Stock [Member]
Preferred Shares [Abstract]
Series A Convertible Preferred shares outstanding (in shares)	70,000
Preferred stock dividend rate (in hundredths)	3.00%
Preferred share dividend (in dollars per shares)	$ 1.50
Share conversion price (in dollars per share)	$ 4.00
Common stock conversion ratio	12.5