Consolidated Statements of Shareholders' Equity - USD ($) shares in Thousands, $ in Thousands		Total	Common Stock	Additional Paid-In Capital	(Distributions in Excess of Earnings/Earnings in Excess of Distributions	Accumulated Other Comprehensive Income (Loss)	Treasury Stock	Noncontrolling Interest
Beginning Balance at Dec. 31, 2016		$ 974,957	$ 1,125	$ 891,993	$ 112,763	$ (30,825)	$ 0	$ (99)
Beginning Balance (in shares) at Dec. 31, 2016			112,548				0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Proceeds from stock options exercised		6,962	$ 4	6,958
Proceeds from stock options exercised (in shares)			358
Tax benefit related to equity compensation		0
Stock based compensation expense		19,844		19,844
Shares withheld for net settlements of share-based awards	[1]	(4,142)	$ (1)	(4,141)
Shares withheld for net settlements of share-based awards (in shares)	[1]		(136)
Restricted stock granted		0	$ 9	(9)
Restricted stock granted (in shares)			933
Restricted stock canceled		0	$ (1)	1
Restricted stock canceled (in shares)			65
Dividends - paid		(227,463)			(227,463)
Issuance of common stock - prospectus supplement		275,867	$ 104	275,763
Issuance of common stock - prospectus supplement (in shares)			10,350
Purchase of treasury shares		0
Purchase of treasury shares (in shares)			0
Issuance of common stock (ESPP)		497		497
Issuance of common stock (ESPP) (in shares)			20
Net Income		146,024			146,241			(217)
Other comprehensive income (loss)		6,373				6,379		(6)
Ending Balance at Dec. 31, 2017		1,198,919	$ 1,240	1,190,906	31,541	(24,446)		(322)
Ending Balance (in shares) at Dec. 31, 2017			124,008
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Proceeds from stock options exercised		1,887	$ 1	1,886
Proceeds from stock options exercised (in shares)			103
Stock based compensation expense		22,049		22,049
Shares withheld for net settlements of share-based awards	[1]	(3,820)	$ (2)	(3,818)
Shares withheld for net settlements of share-based awards (in shares)	[1]		(173)
Restricted stock granted		0	$ 9	(9)
Restricted stock granted (in shares)			906
Restricted stock canceled		0
Restricted stock canceled (in shares)			(73)
Dividends - paid		(229,498)			(229,498)
Purchase of treasury shares		(95,175)					$ (95,175)
Purchase of treasury shares (in shares)			4,210				4,210
Issuance of common stock (ESPP)		534		534
Issuance of common stock (ESPP) (in shares)			24
Other adjustments to Additional Paid-In-Capital	[2]	(632)		(632)
Net Income		144,827			145,089			(262)
Other comprehensive income (loss)		813				828		(15)
Ending Balance at Dec. 31, 2018		1,039,904	$ 1,248	1,210,916	(52,868)	(23,618)	$ (95,175)	(599)
Ending Balance (in shares) at Dec. 31, 2018			120,585				4,210
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Proceeds from stock options exercised		$ 1,258	$ 0	1,258
Proceeds from stock options exercised (in shares)		78	78
Stock based compensation expense		$ 22,344		22,344
Shares withheld for net settlements of share-based awards	[1]	(4,179)	$ (2)	(4,177)
Shares withheld for net settlements of share-based awards (in shares)	[1]		(198)
Restricted stock granted		0	$ 8	(8)
Restricted stock granted (in shares)			788
Restricted stock canceled		0
Restricted stock canceled (in shares)			58
Dividends - paid		(232,546)			(232,546)
Purchase of treasury shares		0					$ 0
Purchase of treasury shares (in shares)			0				0
Increase in Ownership of Subsidiary				0
Issuance of common stock (ESPP)		532		532
Issuance of common stock (ESPP) (in shares)			30
Net Income		166,412			166,603			(191)
Other comprehensive income (loss)		3,291				2,315		8
Other comprehensive income (loss)		2,323
Ending Balance at Dec. 31, 2019		$ 996,048	$ 1,254	$ 1,230,865	$ (119,779)	$ (20,335)	$ (95,175)	$ (782)
Ending Balance (in shares) at Dec. 31, 2019			121,225				4,210

[1] During the years ended December 31, 2019, 2018 and 2017, the Company withheld shares through net share settlements to satisfy statutory tax withholding requirements upon vesting of shares of restricted stock held by employees.

[2] Represents a cumulative-effect adjustment upon adoption of ASU No. 2016-16, "Income Taxes - Intra-Entity Transfers of Assets Other Than Inventory." Refer to Note 1 - Summary of Business Organization, Operations and Significant Accounting Policies - Recent Accounting Pronouncements for further information.