Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Preferred Stock Including Additional Paid in Capital [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Noncontrolling Interest [Member]
Beginning Balance at Dec. 31, 2014	$ 703,911	$ 47,753	$ 82,962	$ 610,903	$ (37,396)	$ (697)	$ 386
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income attributable to the Company	18,783	0	0	0	18,783	0	0
Other comprehensive income/ (loss), net of tax	1,817	0	0	0	0	1,817	0
Dividends paid to common shareholders: $0.09 per share	(7,424)	0	0	(7,424)	0	0	0
Dividends paid to preferred shareholders	(869)	0	0	(869)	0	0	0
Net Change in Noncontrolling Interests	2,215	0	0	0	0	0	2,215
Net proceeds from issuance of [Abstract]
Net proceeds from issuance of common stock	679	0	59	620	0	0	0
Issuance of shares through incentive stock grants, net of shares forfeited, canceled, or withheld for employee taxes, value	(229)	0	(9)	(220)	0	0	0
Amortization of stock compensation and employee stock purchase plan	1,779	0	0	1,779	0	0	0
Stock options exercised	290	0	40	250	0	0	0
Tax benefit/ (deficiency) from certain stock compensation awards	(415)	0	0	(415)	0	0	0
Other equity adjustments	(478)	0	0	(478)	0	0	0
Ending Balance at Mar. 31, 2015	720,059	47,753	83,052	604,146	(18,613)	1,120	2,601
Beginning Balance at Dec. 31, 2015	746,613	47,753	83,411	600,670	12,886	(1,500)	3,393
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income attributable to the Company	18,041	0	0	0	18,041	0	0
Other comprehensive income/ (loss), net of tax	8,187	0	0	0	0	8,187	0
Dividends paid to common shareholders: $0.09 per share	(8,318)	0	0	0	(8,318)	0	0
Dividends paid to preferred shareholders	(869)	0	0	0	(869)	0	0
Net Change in Noncontrolling Interests	(277)	0	0	0	0	0	(277)
Stock Repurchased During Period, Value	(2,750)	0	(245)	(2,505)	0	0	0
Net proceeds from issuance of [Abstract]
Net proceeds from issuance of common stock	739	0	77	662	0	0	0
Issuance of shares through incentive stock grants, net of shares forfeited, canceled, or withheld for employee taxes, value	(161)	0	(257)	96	0	0	0
Amortization of stock compensation and employee stock purchase plan	(442)	0	0	(442)	0	0	0
Stock options exercised	281	0	38	243	0	0	0
Tax benefit/ (deficiency) from certain stock compensation awards	(658)	0	0	(658)	0	0	0
Other equity adjustments	1,759	0	0	1,759	0	0	0
Ending Balance at Mar. 31, 2016	$ 762,145	$ 47,753	$ 83,024	$ 599,825	$ 21,740	$ 6,687	$ 3,116