Consolidated Statement Of Equity - USD ($) $ in Thousands	Total	Revision of Prior Period, Accounting Standards Update, Adjustment	Common Stock [Member]	Additional Paid-in Capital [Member]	Cumulative Dividends In Excess Of Net Income [Member]	Cumulative Dividends In Excess Of Net Income [Member] Revision of Prior Period, Accounting Standards Update, Adjustment	Accumulated Other Comprehensive Income (Loss) [Member]	Parent [Member]	Parent [Member] Revision of Prior Period, Accounting Standards Update, Adjustment	Noncontrolling Interest [Member]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	$ 1,389,713		$ 427	$ 1,369,919	$ 18,068		$ 1,299	$ 1,389,713		$ 0
Balance, shares at Dec. 31, 2018			42,700,411
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock Issued During Period, Shares, New Issues	618,654
Net income (loss) attributable to common stockholders	$ 75,658
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest	(1)
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	70,899
Balance, shares at Jun. 30, 2019			43,357,018
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	1,419,686		$ 434	1,419,228	2,842		(3,459)	1,419,045		641
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	$ 1,498,252		$ 446	1,505,948	(5,331)		(3,432)	1,497,631		621
Balance, shares at Dec. 31, 2019	44,587,486		44,587,486
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock Issued During Period, Shares, New Issues	0
Net income (loss) attributable to common stockholders	$ 105,392
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest	96
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	$ 98,185
Balance, shares at Jun. 30, 2020	44,650,002		44,650,002
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	$ 1,503,469		$ 447	$ 1,505,265	$ (2,618)		$ (10,735)	$ 1,492,359		$ 11,110
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Retained Earnings (Accumulated Deficit)		$ (4,225)				$ (4,225)			$ (4,225)