CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (Parenthetical)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Issuance of stock
Shares in connection with exercise of options (in shares)		7,850	20,360
Shares of restricted stock (in shares)	108,646	76,458	79,823
Shares in connection with Valent acquisition (in shares)	783,798