Earnings per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands			3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Numerator:
Net (loss) income attributable to common shareholders			$ (2,288)	$ (28,153)	$ 12,722	$ 16,225
Earnings allocated to unvested restricted shares			0	(105)	(244)	(295)
Net (loss) income attributable to common shareholders excluding amounts attributable to unvested restricted shares			$ (2,288)	$ (28,258)	$ 12,478	$ 15,930
Denominator for (loss) earnings per common share – basic:
Weighted average number of common shares outstanding			213,385	212,995	213,312	212,932
Effect of dilutive securities:
Stock options			0	0	0	0
RSUs			0	0	0	124
Denominator for (loss) earnings per common share – diluted:
Weighted average number of common and common equivalent shares outstanding			213,385	212,995	213,312	213,056
Earnings Per Share, Other Disclosures
Weighted average number of shares of restricted common stock			868	661	790	641
Antidilutive Securities Excluded from Computation of Earnings per Share [Line Items]
Number of options outstanding	16	22	16	22	16	22
Weighted average exercise price of outstanding options (in dollars per share)	$ 15.87	$ 17.34	$ 15.87	$ 17.34	$ 15.87	$ 17.34
Weighted average number of RSUs			974	839	972	836
Restricted shares
Earnings Per Share, Other Disclosures
Unvested restricted common stock	868	660	868	660	868	660	535
Stock options
Antidilutive Securities Excluded from Computation of Earnings per Share [Line Items]
Number of outstanding options that would be anti-dilutive	16	18
Weighted average exercise price of outstanding options excluded from diluted EPS calculation (in dollars per share)	$ 15.87	$ 18.58
RSUs
Earnings Per Share, Other Disclosures
Unvested restricted common stock	974		974		974		839
Antidilutive Securities Excluded from Computation of Earnings per Share [Line Items]
Number of RSUs eligible for future conversion	974	839	974	839	974	839