CONDENSED CONSOLIDATED STATEMENT OF CHANGES IN EQUITY (Unaudited) - 3 months ended Mar. 31, 2018 - USD ($) $ in Thousands	Total	Common Stock	Treasury Stock	Additional Paid-In Capital	Retained Earnings	Noncontrolling Interest Non Redeemable
Beginning balance, Amount at Dec. 31, 2017	$ 506,591	$ 226	$ (42,249)	$ 126,490	$ 364,401	$ 57,723
Beginning balance, Shares at Dec. 31, 2017		22,640,046
Beginning balance, Treasury Shares at Dec. 31, 2017	(4,890,504)		4,890,504
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ 5,592				4,995	597
Acquired noncontrolling interest	1,235					1,235
Noncontrolling Interest Distributions	(615)					(615)
Sale of noncontrolling interest	3,554			(2,029)		5,583
Purchase of additional controlling interest	(56)			(44)		(12)
Nonvested stock compensation	1,601			1,601
Issuance of vested stock		$ 2		(2)
Issuance of vested stock, Shares		165,567
Treasury shares redeemed to pay income tax	$ (3,467)		$ (3,467)
Treasury shares redeemed to pay income tax, Shares	(56,772)		56,772
Issuance of common stock under Employee Stock Purchase Plan	$ 332			332
Issuance of common stock under Employee Stock Purchase Plan, Shares	5,534	5,534
Ending balance, Amount at Mar. 31, 2018	$ 514,767	$ 228	$ (45,716)	$ 126,348	$ 369,396	$ 64,511
Ending balance, Shares at Mar. 31, 2018		22,811,147
Ending balance, Treasury Shares at Mar. 31, 2018	(4,947,276)		4,947,276