Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended																12 Months Ended
		Dec. 31, 2017	[1]	Sep. 30, 2017	[1]	Jun. 30, 2017	[1]	Mar. 31, 2017	[1]	Dec. 31, 2016	[1]	Sep. 30, 2016	[1]	Jun. 30, 2016	[1]	Mar. 31, 2016	[1]	Dec. 31, 2017		Dec. 31, 2016		Dec. 31, 2015
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Income from Continuing Operations, Including Portion Attributable to Noncontrolling Interest																		$ 40,189		$ 70,244		$ 62,921
Net Income (Loss) Attributable to Noncontrolling Interest		$ 1,278		$ 1,074		$ 1,150		$ 966		$ 1,147		$ 1,110		$ 989		$ 911		4,468		4,157		4,407
Income (Loss) from Continuing Operations Attributable to Parent																		35,721		66,087		58,514
Noncontrolling Interest, Change in Redemption Value																		(1,412)		(588)		464	[2]
Preferred Stock Dividends and Other Adjustments																		(3,475)		(3,475)		(3,475)
Other Preferred Stock Dividends and Adjustments																		(4,887)		(4,063)		(3,011)
Net Income (Loss) from Continuing Ops Available to Common Stockholders, Basic																		30,834		62,024		55,503	[3]
Net income from discontinued operations		$ 989		$ 1,186		$ 1,063		$ 1,632		$ 1,184		$ 1,047		$ 1,245		$ 2,065		4,870	[4]	5,541	[4]	6,411	[4]
Net income attributable to common shareholders for basic earnings per share calculation																		$ 35,704		$ 67,565		$ 61,914	[3]
Income (Loss) from Continuing Operations, Per Basic Share																		$ 0.37		$ 0.76		$ 0.69
Income (Loss) from Discontinued Operations, Net of Tax, Per Basic Share																		0.06		0.07		0.08
Earnings (Loss) Per Share, Basic		$ (0.24)	[5]	$ 0.23	[5]	$ 0.28	[5]	$ 0.18	[5]	$ 0.19	[5]	$ 0.23	[5]	$ 0.19	[5]	$ 0.22	[5]	$ 0.43		$ 0.83		$ 0.77
Net Income (Loss) from Continuing Operations Available to Common Stockholders, Diluted																		$ 30,834		$ 62,024		$ 55,503	[3]
Net income attributable to common shareholders for basic earnings per share calculation																		$ 35,704		$ 67,565		$ 61,914
Income (Loss) from Continuing Operations, Per Diluted Share																		$ 0.36		$ 0.74		$ 0.66
Income (Loss) from Discontinued Operations, Net of Tax, Per Diluted Share																		0.06		0.07		0.08
Earnings/ (Loss) Per Share, Diluted		$ (0.24)	[5]	$ 0.22	[5]	$ 0.27	[5]	$ 0.17	[5]	$ 0.19	[5]	$ 0.22	[5]	$ 0.18	[5]	$ 0.21	[5]	0.42		0.81		0.74
Common Stock, Dividends, Per Share, Cash Paid																		$ 0.44		$ 0.40		$ 0.36
Participating Securities, Distributed and Undistributed Earnings (Loss), Basic																				$ 4		$ 90
Undistributed Earnings (Loss) Allocated to Participating Securities, Basic																				8		92
NI To Common SH Difference Between Two Class And Treasury Method																				$ 12		$ 182
Earnings Per Share, Basic, Undistributed																						$ 0.01
WtdAvg Shares OS Recon Between Two Class and Treasury Method																				7,185		167,937
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount																		1,000		1,000		1,000
Shares Excluded Due to Exercise Price Exceeding Average Price During Period																		67,000		270,000		548,000
Common Stock [Member]
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Weighted Average Number of Shares Outstanding, Basic																		82,430,633		81,264,273		80,885,253
Incremental Common Shares Attributable to Share-based Payment Arrangements																		1,313,953		1,002,153		1,301,448	[3],[6]
Incremental Common Shares Attributable to Call Options and Warrants																		1,057,979		942,700		1,206,389	[6]
Weighted Average Number Diluted Shares Outstanding Adjustment																		2,371,932		1,944,853		2,507,837
Weighted Average Number of Shares Outstanding, Diluted																		84,802,565		83,209,126		83,393,090	[3],[6]
Convertible Debt Securities [Member]
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	[7]																	1,000		1,000		1,000
Stock Compensation Plan [Member]
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Shares Excluded Due to Exercise Price Exceeding Average Price During Period																		67,000		270,000		548,000	[8]

[1] Due to rounding, the sum of the four quarters may not add to the year to date total.

[2] See Part II. Item 8. “Financial Statements and Supplementary Data - Note 14: Noncontrolling Interests” for a description of the redemption values related to the redeemable noncontrolling interests. In accordance with ASC 480, Distinguishing Liabilities from Equity (“ASC 480”), an increase in redemption values 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.

[3] The Company presents its EPS based on the treasury stock method. The Company reverted to the treasury stock presentation from the two-class presentation due to the immaterial number of participating shares outstanding as of March 31, 2016. There is no difference between the calculation of EPS based on the treasury stock method and the calculation of EPS based on the two-class method for the year ended December 31, 2017.If the EPS presentation had been based on the two-class method, the following adjustments would have been made to the presentation of EPS for the year ended December 31, 2016. Net income attributable to common shareholders would have been reduced by an additional $4 thousand, for the year ended December 31, 2016. The allocation of net income to participating securities would have been $8 thousand for the year ended December 31, 2016, reducing net income attributable to common shareholders by a total of $12 thousand for the same period. Basic EPS would not change. Weighted average diluted shared outstanding would have been reduced by 7,185 shares for the year ended December 31, 2016. Diluted EPS would not change. If the EPS presentation had been based on the two-class method, the following adjustments would have been made to the presentation of EPS for the year ended December 31, 2015. Net income attributable to common shareholders would have been reduced by an additional $90 thousand for the year ended December 31, 2015, and the allocation of net income to participating securities would have been $92 thousand for the same period, reducing net income attributable to common shareholders by a total of $182 thousand, for the same period. Total basic EPS and basic EPS from continuing operations would each decrease by $0.01 per share for the year ended December 31, 2015. Weighted average diluted shares outstanding would have been reduced by 167,937 shares for the same period. Diluted EPS would not change.

[4] The Holding Company and Eliminations calculation of Net Income attributable to the Company includes net income from Discontinued Operations for the years ended December 31, 2017, 2016 and 2015 of $4.9 million, $5.5 million, and $6.4 million, respectively

[5] Includes the effect of adjustments to net income attributable to the Company to arrive at net income attributable to common shareholders.

[6] The diluted EPS computations for the years ended December 31, 2017, 2016, and 2015 do not assume the conversion, exercise or contingent issuance of the following shares for the following periods because the result would have been antidilutive for the periods indicated. As a result of the anti-dilution, the potential common shares excluded from the diluted EPS computation are as follows: For the year ended December 31, 2017 2016 2015Shares excluded due to anti-dilution (treasury stock method):(In thousands)Potential common shares from: Convertible trust preferred securities (a)1 1 1Total shares excluded due to anti-dilution1 1 1 For the year ended December 31, 2017 2016 2015Shares excluded due to exercise price exceeding the average market price of common shares during the period (total outstanding):(In thousands)Potential common shares from: Options, restricted stock, or other dilutive securities (b)67 270 548Total shares excluded due to exercise price exceeding the average market price of common shares during the period67 270 548(a) If the effect of the conversion of the trust preferred securities would have been dilutive, an immaterial amount of interest expense, net of tax, related to the convertible trust preferred securities would have been added back to net income attributable to common shareholders for the diluted EPS computation for the years presented.(b)Options to purchase shares of common stock, non-participating performance- and certain time-based restricted stock, and other dilutive securities that were outstanding at period ends were not included in the computation of diluted EPS or in the above anti-dilution table because their exercise or conversion prices were greater than the average market price of the common shares during the respective periods.

[7] If the effect of the conversion of the trust preferred securities would have been dilutive, an immaterial amount of interest expense, net of tax, related to the convertible trust preferred securities would have been added back to net income attributable to common shareholders for the diluted EPS computation for the years presented.

[8] Options to purchase shares of common stock, non-participating performance- and certain time-based restricted stock, and other dilutive securities that were outstanding at period ends were not included in the computation of diluted EPS or in the above anti-dilution table because their exercise or conversion prices were greater than the average market price of the common shares during the respective periods.