Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Earnings Per Share [Abstract]
Net income attributable to common shareholders	$ 35,641	$ 29,993
Weighted average common shares outstanding - basic (in shares)	112,829	112,594
Net effect of dilutive securities:
Contingently issuable performance shares and restricted stock units (in shares)	264	268
Weighted average common shares outstanding — diluted (in shares)	113,093	112,862
Earnings per weighted-average common share outstanding
Net income attributable to common shareholders - basic (in dollars per share)	$ 0.32	$ 0.27
Net income attributable to common shareholders - diluted (in dollars per share)	$ 0.32	$ 0.27