Shareholders' Equity - Changes in Shareholders' Equity (Details) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Changes in shareholders' equity that are attributable to the Company's shareholders and to non controlling interests
Beginning Balance	$ 912,082	$ 996,048
Stock-based compensation expense	7,402	9,768
Dividends paid	(30,486)	(57,703)
Other adjustment to additional paid-in capital	153	8,925
Purchase of treasury shares	(153)	(9,009)
Shares withheld for net settlements of share - based awards	(1,901)	(2,632)
Issuance of common stock - ESPP	116	150
Net income (loss)	50,483	25,121
Other comprehensive income (loss)	2,477	(13,212)
Ending Balance	940,173	957,456
Common shares
Changes in shareholders' equity that are attributable to the Company's shareholders and to non controlling interests
Beginning Balance	$ 1,262	$ 1,254
Beginning Balance (shares)	121,318	121,225
Proceeds from exercise of stock options (shares)		0
Restricted stock granted	$ 12	$ 9
Restricted stock granted (shares)	1,248	900
Restricted stock canceled (shares)	(18)	(21)
Purchase of treasury shares (in shares)	(17)	(554)
Shares withheld for net settlements of share - based awards	$ (2)	$ (2)
Shares withheld for net settlements of share-based awards (shares)	(243)	(174)
Issuance of common stock - ESPP		$ 1
Issuance of common stock - ESPP (shares)	15	10
Ending Balance	$ 1,272	$ 1,262
Ending Balance (shares)	122,303	121,386
Additional Paid-In Capital
Changes in shareholders' equity that are attributable to the Company's shareholders and to non controlling interests
Beginning Balance	$ 1,262,267	$ 1,230,865
Proceeds from exercise of stock options		0
Stock-based compensation expense	7,402	9,768
Restricted stock granted	(12)	(9)
Other adjustment to additional paid-in capital	153	8,925
Shares withheld for net settlements of share - based awards	(1,899)	(2,630)
Issuance of common stock - ESPP	116	149
Ending Balance	1,268,027	1,247,068
Distributions in Excess of Earnings
Changes in shareholders' equity that are attributable to the Company's shareholders and to non controlling interests
Beginning Balance	(222,892)	(119,779)
Dividends paid	(30,486)	(57,703)
Net income (loss)	50,544	25,181
Ending Balance	(202,834)	(152,301)
Accumulated Other Comprehensive Loss
Changes in shareholders' equity that are attributable to the Company's shareholders and to non controlling interests
Beginning Balance	(22,589)	(20,335)
Other comprehensive income (loss)	2,479	(13,164)
Ending Balance	(20,110)	(33,499)
Treasury shares
Changes in shareholders' equity that are attributable to the Company's shareholders and to non controlling interests
Beginning Balance	$ (104,946)	$ (95,175)
Beginning Balance (shares)	4,835	4,210
Purchase of treasury shares	$ (153)	$ (9,009)
Purchase of treasury shares (in shares)	17	554
Ending Balance	$ (105,099)	$ (104,184)
Ending Balance (shares)	4,852	4,764
Noncontrolling Interests
Changes in shareholders' equity that are attributable to the Company's shareholders and to non controlling interests
Beginning Balance	$ (1,020)	$ (782)
Net income (loss)	(61)	(60)
Other comprehensive income (loss)	(2)	(48)
Ending Balance	$ (1,083)	$ (890)