Share-Based Payments (Details)	12 Months Ended		12 Months Ended	6 Months Ended		24 Months Ended	30 Months Ended			12 Months Ended
	Dec. 31, 2012 plan	Dec. 31, 2011	Dec. 31, 2012 Employee Stock	Jun. 30, 2005 Incentive Plan, 1998	Jun. 30, 2003 Incentive Plan, 1998	Dec. 31, 1999 Incentive Plan, 1998	Jun. 30, 2002 Incentive Plan, 1998	Dec. 31, 2012 Incentive Plan, 1998	Dec. 31, 2012 Equity Incentive Plan, 2007	Dec. 31, 2012 Director and Officer	Dec. 31, 2012 Employee
Share-based Compensation Arrangement by Share-based Payment Award
Number of share-based compensation plans	2
Options, grants in period, gross	187,000					1,066,000	1,248,250
Share-based payment award, award vesting period						9 years 9 months 18 days	6 years			3 years	4 years
Share-based payment award, accelerated vesting, number				300,494	637,089
Share-based payment award, number of shares authorized								2,500,000	1,000,000
Share-based payment award, expiration period	10 years
Share-based payment award, options, outstanding, number	1,137,283	1,160,933						578,615	558,668
Number of options authorized and unissued								0	357,410
Share-based payment award, maximum employee subscription rate			10.00%
Number of shares contributed by employer per share of employee contributed shares			9