Consolidated Statement Of Equity - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Cumulative Dividends In Excess Of Net Income [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Parent [Member]	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]
Net income (loss) attributable to common stockholders	35,679			35,679	(957)	34,722
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest	0
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	34,722
Stock Issued During Period, Shares, New Issues		462,925
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture		35,982
Stock Issued During Period, Value, Stock Options Exercised		$ (5)
Stock Issued During Period, Value, New Issues	35,913		35,908			35,913
Share-based Payment Arrangement, Decrease for Tax Withholding Obligation	(1,006)		1,006			1,006
Share-based compensation	2,001		2,001			2,001
Dividends declared, $1.54 per share	(45,359)			(45,359)		(45,359)
Balance, shares at Mar. 31, 2019		43,199,318
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	1,415,984	$ 432	1,406,822	8,388	342	1,415,984	0
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]
Noncontrolling Interest, Increase from Subsidiary Equity Issuance	$ 10,791						10,791
Net income (loss) attributable to common stockholders	61,023			61,023	(8,699)	52,324
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest	39						39
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	52,363
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture		62,516
Stock Issued During Period, Value, Stock Options Exercised	(1)	$ (1)	(2)			(1)
Stock Issued During Period, Value, New Issues	85		85			85
Share-based Payment Arrangement, Decrease for Tax Withholding Obligation	(2,705)		2,705			2,705
Share-based compensation	1,845		1,845			1,845
Dividends declared, $1.54 per share	(49,226)			(49,226)		(49,226)
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders	$ (16)						16
Balance, shares at Mar. 31, 2020	44,650,002	44,650,002
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	$ 1,506,993	$ 447	$ 1,505,001	2,241	$ (12,131)	1,495,558	$ 11,435
Cumulative Effect of New Accounting Principle in Period of Adoption	$ (4,225)			$ (4,225)		$ (4,225)