Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended																12 Months Ended
		Dec. 31, 2015		Sep. 30, 2015		Jun. 30, 2015		Mar. 31, 2015		Dec. 31, 2014		Sep. 30, 2014		Jun. 30, 2014		Mar. 31, 2014		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Income from Continuing Operations, Including Portion Attributable to Noncontrolling Interest																		$ 62,921	$ 67,405	$ 66,691
Net Income (Loss) Attributable to Noncontrolling Interest		$ 921	[1]	$ 994	[1]	$ 1,263	[1]	$ 1,229	[1]	$ 1,322	[1]	$ 1,167	[1]	$ 1,025	[1]	$ 1,236	[1]	4,407	4,750	3,948
Income (Loss) from Continuing Operations Attributable to Parent																		58,514	62,655	62,743
Noncontrolling Interest, Change in Redemption Value	[2]																	464	(525)	(368)
Preferred Stock Dividends and Other Adjustments																		(3,566)	(3,703)	(14,689)	[3]
Other Preferred Stock Dividends and Adjustments																		(3,102)	(4,228)	(15,057)
Net Income Loss Continuing Available to Common Shareholders Basic Before Participating																		55,412	58,427	47,686
Undistributed Earnings Continuing Ops Allocated to Participating Securities																		(74)	(282)	(1,243)
Net Income (Loss) from Continuing Ops Available to Common Stockholders, Basic																		55,338	58,145	46,443
Net income from discontinued operations		$ 1,455	[1]	$ 1,316	[1]	$ 1,546	[1]	$ 2,094	[1]	$ 1,510	[1]	$ 1,272	[1]	$ 1,450	[1]	$ 1,928	[1]	6,411	6,160	7,792
Undistributed Earnings Discontinued Operations Allocated to Participating Securities																		(18)	(53)	(336)
Net Income (Loss) from Discontinued Ops Available to Common Stockholders, Basic																		6,393	6,107	7,456
Net Income (Loss) Available to Common Stockholders Basic before Allocation to Participating Securities																		61,823	64,587	55,478
Undistributed Earnings (Loss) Allocated to Participating Securities, Basic																		92	335	1,579
Net income attributable to common shareholders for basic earnings per share calculation																		$ 61,731	$ 64,252	$ 53,899
Income (Loss) from Continuing Operations, Per Basic Share																		$ 0.68	$ 0.73	$ 0.60
Income (Loss) from Discontinued Operations, Net of Tax, Per Basic Share																		0.08	0.08	0.10
Earnings (Loss) Per Share, Basic		$ 0.17	[4]	$ 0.17	[4]	$ 0.20	[4]	$ 0.22	[4]	$ 0.14	[4]	$ 0.22	[4]	$ 0.26	[4]	$ 0.20	[4]	$ 0.76	$ 0.81	$ 0.70
Dilutive Securities, Effect on Basic Earnings Per Share																		$ 0	$ 0	$ 0
Net Income (Loss) from Continuing Operations Available to Common Stockholders, Diluted																		$ 55,338	$ 58,145	$ 46,443
Income (Loss) from Continuing Operations, Per Diluted Share																		$ 0.66	$ 0.72	$ 0.59
Income (Loss) from Discontinued Operations, Net of Tax, Per Diluted Share																		0.08	0.07	0.09
Earnings/ (Loss) Per Share, Diluted		$ 0.17	[4]	$ 0.16	[4]	$ 0.20	[4]	$ 0.21	[4]	$ 0.13	[4]	$ 0.22	[4]	$ 0.25	[4]	$ 0.20	[4]	0.74	0.79	0.68
Common Stock, Dividends, Per Share, Cash Paid																		$ 0.36	$ 0.32	$ 0.24
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																		548,000	829,000	1,399,000
Series B Preferred Stock [Member]
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Preferred Stock Dividends and Other Adjustments																				$ (11,700)
Common Stock [Member]
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Weighted Average Number of Shares Outstanding, Basic																		80,885,253	78,921,480	77,373,817
Incremental Common Shares Attributable to Share-based Payment Arrangements	[5]																	1,133,511	759,138	656,066
Incremental Common Shares Attributable to Call Options and Warrants	[5]																	1,206,389	1,198,613	723,641
Weighted Average Number Diluted Shares Outstanding Adjustment																		2,339,900	1,957,751	1,379,707
Weighted Average Number of Shares Outstanding, Diluted	[5]																	83,225,153	80,879,231	78,753,524
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	[6]																	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	[7]																	548,000	829,000	1,399,000

[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] Consideration paid in excess of carrying value for the repurchase of the Series B preferred stock of $11.7 million is considered a deemed dividend and, for purposes of calculating EPS, reduces net income attributable to common shareholders for the year ended December 31, 2013.

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

[5] The diluted EPS computations for the years ended December 31, 2015, 2014, and 2013 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, 2015 2014 2013Shares excluded due to anti-dilution (treasury 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, 2015 2014 2013Shares 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)548 829 1,399Total shares excluded due to exercise price exceeding the average market price of common shares during the period548 829 1,399(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.

[6] 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.

[7] 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.