Condensed Consolidated Statements Of Equity (unaudited) - USD ($) $ in Thousands	Total	Cumulative Effect, Period of Adoption Adjustment	Common Stock	Treasury Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income (loss)	Noncontrolling Interest
Common Stock, Shares, Outstanding at Dec. 31, 2018			60,048,567	44,253
Total equity at Dec. 31, 2018	$ 2,287,423		$ 60,049	$ (2,510)	$ 1,450,569	$ 700,396	$ (26,916)	$ 105,835
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	107,362					103,808		3,554
Other comprehensive income (loss), net of tax	457						457
Dividends on Common Stock	(30,332)					(30,332)
Share-based compensation, shares			48,956	(20,497)
Share-based compensation	538		$ 49	$ 1,078	(589)
Issuance of common stock, shares			280,497
Issuance of common stock	19,999		$ 280		19,719
Issuance costs	(289)				(289)
Distributions to noncontrolling interest	(4,846)							(4,846)
Common Stock, Shares, Outstanding at Mar. 31, 2019			60,378,020	23,756
Total equity at Mar. 31, 2019	$ 2,383,702	$ 3,390	$ 60,378	$ (1,432)	1,469,410	777,262	(26,459)	104,543
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common Stock, Dividends, Per Share, Cash Paid	$ 0.505
Common Stock, Shares, Outstanding at Dec. 31, 2018			60,048,567	44,253
Total equity at Dec. 31, 2018	$ 2,287,423		$ 60,049	$ (2,510)	1,450,569	700,396	(26,916)	105,835
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	125,055
Other comprehensive income (loss), net of tax	689
Issuance costs			$ (700)
Common Stock, Shares, Outstanding at Jun. 30, 2019			61,091,385	25,359
Total equity at Jun. 30, 2019	2,419,998	(3)	$ 61,091	$ (1,544)	1,522,208	761,222	(26,227)	103,248
Common Stock, Shares, Outstanding at Mar. 31, 2019			60,378,020	23,756
Total equity at Mar. 31, 2019	2,383,702	3,390	$ 60,378	$ (1,432)	1,469,410	777,262	(26,459)	104,543
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	17,693					14,583		3,110
Other comprehensive income (loss), net of tax	232						232
Dividends on Common Stock	(30,620)					(30,620)
Share-based compensation, shares			54,767	1,603
Share-based compensation	3,890		$ 54	$ (112)	3,948
Issuance of common stock, shares			658,598
Issuance of common stock	50,001		$ 659		49,342
Issuance costs	(492)		$ (500)		(492)
Distributions to noncontrolling interest	(4,405)							(4,405)
Common Stock, Shares, Outstanding at Jun. 30, 2019			61,091,385	25,359
Total equity at Jun. 30, 2019	$ 2,419,998	(3)	$ 61,091	$ (1,544)	1,522,208	761,222	(26,227)	103,248
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common Stock, Dividends, Per Share, Cash Paid	$ 0.505
Common Stock, Shares, Outstanding at Dec. 31, 2019			61,480,658	3,956
Total equity at Dec. 31, 2019	$ 2,464,069		$ 61,481	$ (267)	1,552,788	778,776	(30,655)	101,946
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	97,224					93,174		4,050
Other comprehensive income (loss), net of tax	1,273						1,273
Dividends on Common Stock	(32,902)					(32,902)
Share-based compensation, shares			69,378	20,700
Share-based compensation	674		$ 69	$ (1,658)	2,263
Issuance of common stock, shares			1,222,942
Issuance of common stock	100,000		$ 1,223		98,777
Issuance costs	(967)				(967)
Distributions to noncontrolling interest	(4,741)							(4,741)
Common Stock, Shares, Outstanding at Mar. 31, 2020			62,772,978	24,656
Total equity at Mar. 31, 2020	$ 2,624,423	(207)	$ 62,773	$ (1,925)	1,652,861	838,841	(29,382)	101,255
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common Stock, Dividends, Per Share, Cash Paid	$ 0.535
Common Stock, Shares, Outstanding at Dec. 31, 2019			61,480,658	3,956
Total equity at Dec. 31, 2019	$ 2,464,069		$ 61,481	$ (267)	1,552,788	778,776	(30,655)	101,946
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	121,918
Other comprehensive income (loss), net of tax	2,221
Common Stock, Shares, Outstanding at Jun. 30, 2020			62,772,996	26,399
Total equity at Jun. 30, 2020	2,614,496		$ 62,773	$ (1,879)	1,654,563	826,269	(28,434)	101,204
Common Stock, Shares, Outstanding at Mar. 31, 2020			62,772,978	24,656
Total equity at Mar. 31, 2020	2,624,423	$ (207)	$ 62,773	$ (1,925)	1,652,861	838,841	(29,382)	101,255
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	24,694					20,966		3,728
Other comprehensive income (loss), net of tax	948						948
Dividends on Common Stock	(33,538)					(33,538)
Share-based compensation, shares			18	1,743
Share-based compensation	1,827			$ 46	1,781
Issuance costs	(79)				(79)
Distributions to noncontrolling interest	(3,779)							(3,779)
Common Stock, Shares, Outstanding at Jun. 30, 2020			62,772,996	26,399
Total equity at Jun. 30, 2020	$ 2,614,496		$ 62,773	$ (1,879)	$ 1,654,563	$ 826,269	$ (28,434)	$ 101,204
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common Stock, Dividends, Per Share, Cash Paid	$ 0.535