CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (USD $) In Thousands, unless otherwise specified	Total	Series A Preferred Stock [Member]	Series B Preferred Stock [Member]	Common Stock [Member]	Paid-in Capital [Member]	Retained Earnings [Member]	Treasury Stock [Member]	Accumulated Other Comprehensive Income (Loss) [Member]
BALANCES at Dec. 31, 2010	$ 124,120	$ 1	$ 15	$ 140	$ 72,616	$ 51,348	$ 0	$ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends paid	(90)	0	0	0	0	(90)	0	0
Compensation expense for restricted stock	1,256	0	0	0	1,256	0	0	0
Net gain on interest rate swap (long-term Investment) for comprehensive income	64	0	0	0	0	0	0	64
Issuance of shares in connection with acquisitions	1,143	0	0	0	1,143	0	0	0
Vesting of restricted stock	190	0	0	1	189	0	0	0
Acquisition of treasury stock	(1,445)	0	0	0	0	0	(1,445)	0
Net income	31,437	0	0	0	0	31,437	0	0
BALANCES at Dec. 31, 2011	156,675	1	15	141	75,204	82,695	(1,445)	64
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends paid	(90)	0	0	0	0	(90)	0	0
Compensation expense for restricted stock	1,955	0	0	0	1,955	0	0	0
Net gain on interest rate swap (long-term Investment) for comprehensive income	378	0	0	0	0	0	0	378
Issuance of shares in connection with acquisitions	946	0	0	0	946	0	0	0
Vesting of restricted stock	449	0	0	0	449	0	0	0
Acquisition of treasury stock	(3,422)	0	0	0	0	0	(3,422)	0
Cumulative translation adjustment	617	0	0	0	0	0	0	617
Net income	50,985	0	0	0	0	50,985	0	0
BALANCES at Dec. 31, 2012	208,493	1	15	141	78,554	133,590	(4,867)	1,059
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends paid	(90)	0	0	0	0	(90)	0	0
Issuance of common stock	24,358			2	24,356
Compensation expense for restricted stock	2,832	0	0	0	2,832	0	0	0
Net gain on interest rate swap (long-term Investment) for comprehensive income	(387)	0	0	0	0	0	0	(387)
Issuance of shares in connection with acquisitions	3,518	0	0	1	3,517	0	0	0
Vesting of restricted stock	633	0	0	0	633	0	0	0
Acquisition of treasury stock	(304)	0	0	0	0	0	(304)	0
Cumulative translation adjustment	(3,040)	0	0	0	0	0	0	(3,040)
Net income	60,237	0	0	0	0	60,237	0	0
BALANCES at Dec. 31, 2013	$ 296,250	$ 1	$ 15	$ 144	$ 109,892	$ 193,737	$ (5,171)	$ (2,368)