Net Income Per Common Share Weighted average number of common shares outstanding during the period (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Earnings Per Share [Abstract]
Options to purchase common stock outstanding (in shares)	212,000	1,172,729	227,000	1,757,404
Weighted average common shares outstanding
Basic (in shares)	33,595,637	35,249,616	33,525,444	35,279,504
Dilutive effect of stock options and restricted stock (in shares)	677,056	0	596,042	156,608
Weighted average common shares outstanding diluted (in shares)	34,272,693	35,249,616	34,121,486	35,436,112