CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (Parenthetical) - shares	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of shares in connection with acquisitions (in shares)		148,769	36,000
Vesting of restricted stock for common stock (in shares)			69,675
Acquisition of treasury stock (in shares)		191,420	200,000
Issuance of common stock (in shares)	2,722,858
Issuance of treasury shares for vesting of restricted stock (in shares)	264,297	57,401	66,676