Shareholders' Equity - Changes in Shareholders' Equity (Details) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Changes in shareholders' equity that are attributable to the Company's shareholders and to non controlling interests
Beginning Balance	$ 985,068	$ 944,295	$ 912,082	$ 996,048
Proceeds from exercise of stock options				1
Stock-based compensation expense	4,329	4,689	15,755	19,163
Dividends paid		(58,527)	(30,487)	(174,687)
Other adjustment to additional paid-in capital	(3,600)	280	(3,447)	9,479
Purchase of treasury shares		(280)	(153)	(9,562)
Shares withheld for net settlements of share - based awards	(90)		(2,091)	(2,789)
Issuance of common stock - ESPP	72	170	252	465
Net income (loss)	34,641	39,172	127,057	100,947
Other comprehensive income (loss)	(2,714)	2,485	(1,262)	(6,781)
Ending Balance	1,017,706	932,284	1,017,706	932,284
Common shares
Changes in shareholders' equity that are attributable to the Company's shareholders and to non controlling interests
Beginning Balance	$ 1,273	$ 1,262	$ 1,262	$ 1,254
Beginning Balance (shares)	122,409	121,371	121,318	121,225
Restricted stock granted			$ 16	$ 9
Restricted stock granted (shares)	103		1,551	900
Restricted stock canceled			$ (2)
Restricted stock canceled (shares)	(43)	(22)	(154)	(49)
Purchase of treasury shares (in shares)		(25)	(17)	(602)
Shares withheld for net settlements of share - based awards			$ (3)	$ (1)
Shares withheld for net settlements of share-based awards (shares)	(12)	(1)	(268)	(174)
Issuance of common stock - ESPP (shares)	8	16	35	39
Ending Balance	$ 1,273	$ 1,262	$ 1,273	$ 1,262
Ending Balance (shares)	122,465	121,339	122,465	121,339
Additional Paid-In Capital
Changes in shareholders' equity that are attributable to the Company's shareholders and to non controlling interests
Beginning Balance	$ 1,272,014	$ 1,252,037	$ 1,262,267	$ 1,230,865
Proceeds from exercise of stock options				1
Stock-based compensation expense	4,329	4,689	15,755	19,163
Restricted stock granted			(16)	(9)
Restricted stock canceled			2
Other adjustment to additional paid-in capital	(3,600)	280	(3,447)	9,479
Shares withheld for net settlements of share - based awards	(90)		(2,088)	(2,788)
Issuance of common stock - ESPP	72	170	252	465
Ending Balance	1,272,725	1,257,176	1,272,725	1,257,176
Distributions in Excess of Earnings
Changes in shareholders' equity that are attributable to the Company's shareholders and to non controlling interests
Beginning Balance	(160,875)	(174,038)	(222,892)	(119,779)
Dividends paid		(58,527)	(30,487)	(174,687)
Net income (loss)	34,710	39,220	127,214	101,121
Ending Balance	(126,165)	(193,345)	(126,165)	(193,345)
Accumulated Other Comprehensive Loss
Changes in shareholders' equity that are attributable to the Company's shareholders and to non controlling interests
Beginning Balance	(21,132)	(29,554)	(22,589)	(20,335)
Other comprehensive income (loss)	(2,722)	2,481	(1,265)	(6,738)
Ending Balance	(23,854)	(27,073)	(23,854)	(27,073)
Treasury shares
Changes in shareholders' equity that are attributable to the Company's shareholders and to non controlling interests
Beginning Balance	$ (105,099)	$ (104,457)	$ (104,946)	$ (95,175)
Beginning Balance (shares)	4,852	4,787	4,835	4,210
Purchase of treasury shares		$ (280)	$ (153)	$ (9,562)
Purchase of treasury shares (in shares)		25	17	602
Ending Balance	$ (105,099)	$ (104,737)	$ (105,099)	$ (104,737)
Ending Balance (shares)	4,852	4,812	4,852	4,812
Noncontrolling Interests
Changes in shareholders' equity that are attributable to the Company's shareholders and to non controlling interests
Beginning Balance	$ (1,113)	$ (955)	$ (1,020)	$ (782)
Net income (loss)	(69)	(48)	(157)	(174)
Other comprehensive income (loss)	8	4	3	(43)
Ending Balance	$ (1,174)	$ (999)	$ (1,174)	$ (999)