Shareholders' Equity (Details) (USD $) In Thousands, except Share data, unless otherwise specified	1 Months Ended		12 Months Ended
	Jun. 30, 2011	Apr. 30, 2010	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Class of Stock [Line Items]
Common stock issued during the period (in shares)			1,410,491	6,843,733
Acquisition related costs			$ 1,383
Trading Restriction Period			1 year	1 year
Amount of common stock issued for acquisitions			5,202	34,802	4,615
Partial consideration for insignificant acquisition				373
Number of insignificant acquisitions completed				3
Ownership interest in subsidiary (in hundredths)				63.00%
Noncontrolling interest				478
Noncontrolling interest based on a percentage of fair value of assets of less than wholly owned subsidiaries (in hundredths)				37.00%
Stock issued for charitable contribution (in shares)				485,232
Stock issued for charitable contribution				1,851
Proceeds from issuance of stock		41,750	0	0	41,750
Redemption and retirement of preferred stock	41,750		0	(41,750)	0
Preferred stock dividends paid	7,328			7,328
Preferred stock dividends			0	3,153	4,176
Deemed dividend					0
Common Stock [Member]
Class of Stock [Line Items]
Common stock subscribed and issued (in shares)				53,574
Stock issued for Securities Purchase Agreement (in shares)		7,515,000
Common Stock [Member] | Insignificant Acquisitions [Member]
Class of Stock [Line Items]
Common stock issued during the period (in shares)			1,356,917	6,044,898	974,701
Common stock subscribed and issued (in shares)				175,866
Amount of common stock issued for acquisitions			5,202	34,802	3,147
Series A Preferred Stock [Member]
Class of Stock [Line Items]
Stock issued for Securities Purchase Agreement (in shares)		41,750
Deemed dividend					14,900
Restricted Stock [Member] | Insignificant Acquisitions [Member]
Class of Stock [Line Items]
Common stock issued during the period (in shares)			505,038
Amount of common stock issued for acquisitions			$ 1,827