Consolidated Statement of Shareholders' Equity - USD ($) $ in Thousands	Total	Preferred Stock Including Additional Paid in Capital	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income/ (Loss)	Noncontrolling Interests
Beginning Balance at Dec. 31, 2015	$ 746,613	$ 47,753	$ 83,411	$ 600,670	$ 12,886	$ (1,500)	$ 3,393
Increase (Decrease) in Shareholders' Equity [Roll Forward]
Net income attributable to the Company	71,628				71,628
Other comprehensive income/ (loss), net	(11,048)					(11,048)
Dividends paid to common shareholders	(33,110)				(33,110)
Dividends paid to preferred shareholders	(3,475)				(3,475)
Net change in noncontrolling interests	768						768
Repurchase of shares of common stock	(9,323)		(786)	(8,537)
Net proceeds from issuance of:
Net proceeds from issuance of shares of common stock	1,579		166	1,413
Shares of incentive stock grants, net of shares canceled or forfeited and shares withheld for employee taxes	(737)		193	(930)
Exercise of warrants	0		517	(517)
Amortization of stock compensation and employee stock purchase plan	4,112		0	4,112
Stock options exercised	1,725		231	1,494
Tax benefit/ (deficiency) from certain stock compensation awards	(620)			(620)
Other equity adjustments	369			369
Ending Balance at Dec. 31, 2016	768,481	47,753	83,732	597,454	47,929	(12,548)	4,161
Increase (Decrease) in Shareholders' Equity [Roll Forward]
Net income attributable to the Company	40,591				40,591
Other comprehensive income/ (loss), net	5,425					5,425
Dividends paid to common shareholders	(37,054)				(37,054)
Dividends paid to preferred shareholders	(3,475)				(3,475)
Net change in noncontrolling interests	1,025						1,025
Net proceeds from issuance of:
Net proceeds from issuance of shares of common stock	1,601		140	1,461
Shares of incentive stock grants, net of shares canceled or forfeited and shares withheld for employee taxes	(1,430)		(191)	(1,239)
Exercise of warrants	3,003		419	2,584
Amortization of stock compensation and employee stock purchase plan	8,275			8,275
Stock options exercised	882		108	774
Other equity adjustments	(1,380)			(1,380)
Ending Balance at Dec. 31, 2017	785,944	47,753	84,208	607,929	49,526	(8,658)	5,186
Increase (Decrease) in Shareholders' Equity [Roll Forward]
Net income attributable to the Company	80,384				80,384
Other comprehensive income/ (loss), net	(8,727)					(8,727)
Dividends paid to common shareholders	(40,685)				(40,685)
Dividends paid to preferred shareholders	(1,738)				(1,738)
Net change in noncontrolling interests	(5,186)						(5,186)
Redemption of Series D preferred stock	(50,000)	(47,753)		(2,247)
Repurchase of shares of common stock	(20,000)		(1,643)	(18,357)
Net proceeds from issuance of:
Net proceeds from issuance of shares of common stock	1,866		143	1,723
Shares of incentive stock grants, net of shares canceled or forfeited and shares withheld for employee taxes	(1,804)		(275)	(1,529)
Exercise of warrants	372		1,019	(647)
Amortization of stock compensation and employee stock purchase plan	6,050			6,050
Stock options exercised	1,661		204	1,457
Other equity adjustments	5,817			5,817
Ending Balance at Dec. 31, 2018	$ 753,954	$ 0	$ 83,656	$ 600,196	$ 87,821	$ (17,719)	$ 0