CONDENSED CONSOLIDATED STATEMENT OF CHANGES IN EQUITY (Unaudited) - 6 months ended Jun. 30, 2017 - USD ($) $ in Thousands	Total	Common Stock	Treasury Stock	Additional Paid-In Capital	Retained Earnings	Noncontrolling Interest Non Redeemable
Beginning balance, Amount at Dec. 31, 2016	$ 401,552	$ 224	$ (39,135)	$ 119,748	$ 314,289	$ 6,426
Beginning balance, Shares at Dec. 31, 2016		22,429,041
Beginning balance, Treasury Shares at Dec. 31, 2016	(4,828,679)		(4,828,679)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ 20,929				20,771	158
Acquired noncontrolling interest	22,572					22,572
Noncontrolling Interest Distributions	(925)					(925)
Sale of noncontrolling interest	630			348		282
Purchase of additional controlling interest	(184)			(184)
Nonvested stock compensation	3,077			3,077
Issuance of vested stock		$ 2		(2)
Issuance of vested stock, Shares		178,196
Treasury shares redeemed to pay income tax	$ (2,744)		$ (2,744)
Treasury shares redeemed to pay income tax, Shares	(55,818)		(55,818)
Issuance of common stock under Employee Stock Purchase Plan	$ 469			469
Issuance of common stock under Employee Stock Purchase Plan, Shares		10,043
Ending balance, Amount at Jun. 30, 2017	$ 445,376	$ 226	$ (41,879)	$ 123,456	$ 335,060	$ 28,513
Ending balance, Shares at Jun. 30, 2017		22,617,280
Ending balance, Treasury Shares at Jun. 30, 2017	(4,884,497)		(4,884,497)