Earnings Per Share Basic Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net income from continuing operations		$ 19,691	$ 19,699	$ 58,180	$ 52,728
Net Income (Loss) Attributable to Noncontrolling Interest		1,074	1,110	3,190	3,010
Income (Loss) from Continuing Operations Attributable to Parent		18,617	18,589	54,990	49,718
Noncontrolling Interest, Change in Redemption Value	[1]	278	138	283	(341)
Preferred Stock Dividends and Other Adjustments		(868)	(868)	(2,606)	(2,606)
Other Preferred Stock Dividends and Adjustments		(1,146)	(1,006)	(2,889)	(2,265)
Net Income (Loss) from Continuing Ops Available to Common Stockholders, Basic		17,471	17,583	52,101	47,453
Net income from discontinued operations		1,186	1,047	3,881	4,357
Net income attributable to common shareholders for earnings per share calculation		$ 18,657	$ 18,630	$ 55,982	$ 51,810
Income (Loss) from Continuing Operations, Per Basic Share		$ 0.21	$ 0.22	$ 0.63	$ 0.58
Income (Loss) from Discontinued Operations, Net of Tax, Per Basic Share		0.01	0.01	0.05	0.05
Earnings Per Share, Basic		$ 0.23	$ 0.23	$ 0.68	$ 0.64
Common Stock [Member]
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Weighted Average Basic Common Shares Outstanding		82,556,225	81,301,499	82,270,849	81,280,014

[1] See Part II. Item 8. “Financial Statements and Supplementary Data—Note 14: Noncontrolling Interests” in the Company’s Annual Report on Form 10-K for the year ended December 31, 2016 for a description of the redemption values related to the redeemable noncontrolling interests. In accordance with the Financial Accounting Standards Board (“FASB”) Accounting Standards Codification (“ASC”) 480, Distinguishing Liabilities from Equity (“ASC 480”), an increase in redemption value from period to period reduces income attributable to common shareholders. Decreases in redemption value from period to period increase income attributable to common shareholders, but only to the extent that the cumulative change in redemption value remains a cumulative increase since adoption of this standard in the first quarter of 2009.