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Incentive Share Plan (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands							3 Months Ended		9 Months Ended
	Jul. 31, 2020	Sep. 30, 2019	Jun. 30, 2019	Dec. 01, 2018	Mar. 16, 2018	Sep. 06, 2017	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2021	Dec. 31, 2020	Jul. 30, 2018	May 11, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation							$ 1,645	$ 1,719	$ 4,167	$ 4,770
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock granted (in shares)					4,300
Restricted Stock [Member] | Market-Based Vesting (TSR Units) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period									28 months
Unrecognized compensation cost							4,800		$ 4,800
Restricted Stock [Member] | Market-Based Vesting (TSR Units) [Member] | Shares Issued 2017 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting percentage									200.00%
Restricted Stock [Member] | Market-Based Vesting (TSR Units) [Member] | Shared Issued 2018 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting percentage									100.00%
Restricted Stock [Member] | Market-Based Vesting (TSR Units) [Member] | Shares Issued 2019 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting percentage									0.00%
Restricted Stock [Member] | Market-Based Vesting (TSR Units) [Member] | Shares issued 2020 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting percentage									50.00%
Restricted Stock [Member] | Immediate Vesting (CIC Units) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock granted (in shares)						965,000			890,000
Grant date fair value (in dollars per share)						$ 13.05
Time-Based Restricted Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock granted (in shares)					387,499
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period									34 months
Non-Cash Share Based Compensation in 2014 [Member] | Subsequent Event [Member] | Scenario, Forecast [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost											$ 8,400	$ 6,000
2008 Long-Term Equity Incentive Ownership Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of maximum number of shares issued under plan to aggregate shares													12.50%
Shares authorized (in shares)														3,433,831
2008 Long-Term Equity Incentive Ownership Plan [Member] | Restricted Common Shares and Restricted Share Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting percentage									100.00%
2008 Long-Term Equity Incentive Ownership Plan [Member] | Non-Vested Time Based Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost							$ 5,500		$ 5,500
Unrecognized compensation cost, period for recognition									34 months
2008 Long-Term Equity Incentive Ownership Plan [Member] | Non-Cash Share Based Compensation in 2014 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost, period for recognition									24 months
2018 Long-Term Equity Incentive Ownership Plan [Member] | Restricted Stock [Member] | Market-Based Vesting (TSR Units) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock granted (in shares)	545,000		405,417	229,684
Performance period	3 years	3 years		3 years
Grant date fair value (in dollars per share)	$ 5.55	$ 8.22		$ 14.89
2018 Long-Term Equity Incentive Ownership Plan [Member] | Restricted Stock [Member] | Minimum [Member] | Market-Based Vesting (TSR Units) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting percentage	0.00%	0.00%		0.00%
2018 Long-Term Equity Incentive Ownership Plan [Member] | Restricted Stock [Member] | Maximum [Member] | Market-Based Vesting (TSR Units) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting percentage	200.00%	200.00%		200.00%
2018 Long-Term Equity Incentive Ownership Plan [Member] | Time-Based Restricted Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock granted (in shares)	530,000	17,069	317,184
Performance period	3 years	3 years	3 years
Grant date fair value (in dollars per share)	$ 5.83	$ 11.69	$ 10.63

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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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