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Stock-based Compensation - Restricted Common Shares (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Non-cash share compensation			$ 5,338	$ 4,619
2013 Plan \| Restricted common shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)			194,413
Grant date value			$ 3,500
Non-cash share compensation	$ 800	$ 800	1,600	$ 1,500
Unrecognized compensation expense	$ 2,800		$ 2,800
Minimum \| 2013 Plan \| Restricted common shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period			1 year
Maximum \| 2013 Plan \| Restricted common shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period			3 years