Share Based Payments (Summary Of Unvested Share Awards Issued To Employee and Nonemployees) (Details) - USD ($) $ / shares in Units, $ in Thousands	6 Months Ended
	Jun. 30, 2019	Dec. 31, 2018
Unvested Share Awards [Abstract]
Shares issued (in shares)	1,185,422
Vesting schedule (in hundredths)	25.00%
Shares vested (in shares)	300,841	236,258
Unearned Compensation	$ 5,658	$ 3,027
Restricted Share Awards [Member]
Unvested Share Awards [Abstract]
Shares issued (in shares)	173,078
Vesting schedule (in hundredths)	25.00%
Shares vested (in shares)	134,850	70,063
Unearned Compensation	$ 635	$ 829
Restricted Share Awards [Member] | Original Year of Issuance Date 2019 [Member]
Unvested Share Awards [Abstract]
Shares issued (in shares)	31,508
Shares vested (in shares)	8,344	0
Unearned Compensation	$ 334	$ 0
Restricted Share Awards [Member] | Original Year of Issuance Date 2018 [Member]
Unvested Share Awards [Abstract]
Shares issued (in shares)	54,676
Shares vested (in shares)	43,131	2,189
Unearned Compensation	$ 239	$ 641
Restricted Share Awards [Member] | Original Year of Issuance Date 2017 [Member]
Unvested Share Awards [Abstract]
Shares issued (in shares)	41,897
Vesting Period	2 years
Shares vested (in shares)	38,378	24,111
Unearned Compensation	$ 62	$ 174
Restricted Share Awards [Member] | Original Year of Issuance Date 2016 [Member]
Unvested Share Awards [Abstract]
Shares issued (in shares)	29,294
Vesting Period	2 years
Shares vested (in shares)	29,294	29,294
Unearned Compensation	$ 0	$ 0
Restricted Share Awards [Member] | Original Year of Issuance Date 2015 [Member]
Unvested Share Awards [Abstract]
Shares issued (in shares)	15,703
Share price on date of grant (in dollars per share)	$ 28.09
Shares vested (in shares)	15,703	14,469
Unearned Compensation	$ 0	$ 14
Share-based Compensation Award, Tranche One [Member] | Restricted Share Awards [Member] | Original Year of Issuance Date 2017 [Member]
Unvested Share Awards [Abstract]
Vesting schedule (in hundredths)	50.00%
Share-based Compensation Award, Tranche One [Member] | Restricted Share Awards [Member] | Original Year of Issuance Date 2016 [Member]
Unvested Share Awards [Abstract]
Vesting schedule (in hundredths)	50.00%
Share-based Compensation Award, Tranche Two [Member] | Restricted Share Awards [Member] | Original Year of Issuance Date 2017 [Member]
Unvested Share Awards [Abstract]
Vesting schedule (in hundredths)	50.00%
Share-based Compensation Award, Tranche Two [Member] | Restricted Share Awards [Member] | Original Year of Issuance Date 2016 [Member]
Unvested Share Awards [Abstract]
Vesting schedule (in hundredths)	50.00%
Minimum [Member] | Restricted Share Awards [Member] | Original Year of Issuance Date 2019 [Member]
Unvested Share Awards [Abstract]
Share price on date of grant (in dollars per share)	$ 16.61
Vesting Period	0 years
Minimum [Member] | Restricted Share Awards [Member] | Original Year of Issuance Date 2018 [Member]
Unvested Share Awards [Abstract]
Share price on date of grant (in dollars per share)	$ 17.91
Vesting Period	1 year
Minimum [Member] | Restricted Share Awards [Member] | Original Year of Issuance Date 2017 [Member]
Unvested Share Awards [Abstract]
Share price on date of grant (in dollars per share)	$ 18.47
Minimum [Member] | Restricted Share Awards [Member] | Original Year of Issuance Date 2016 [Member]
Unvested Share Awards [Abstract]
Share price on date of grant (in dollars per share)	$ 18.02
Minimum [Member] | Restricted Share Awards [Member] | Original Year of Issuance Date 2015 [Member]
Unvested Share Awards [Abstract]
Vesting Period	2 years
Minimum [Member] | Share-based Compensation Award, Tranche One [Member] | Restricted Share Awards [Member] | Original Year of Issuance Date 2019 [Member]
Unvested Share Awards [Abstract]
Vesting schedule (in hundredths)	50.00%
Minimum [Member] | Share-based Compensation Award, Tranche One [Member] | Restricted Share Awards [Member] | Original Year of Issuance Date 2018 [Member]
Unvested Share Awards [Abstract]
Vesting schedule (in hundredths)	25.00%
Minimum [Member] | Share-based Compensation Award, Tranche One [Member] | Restricted Share Awards [Member] | Original Year of Issuance Date 2015 [Member]
Unvested Share Awards [Abstract]
Vesting schedule (in hundredths)	25.00%
Minimum [Member] | Share-based Compensation Award, Tranche Two [Member] | Restricted Share Awards [Member] | Original Year of Issuance Date 2019 [Member]
Unvested Share Awards [Abstract]
Vesting schedule (in hundredths)	50.00%
Minimum [Member] | Share-based Compensation Award, Tranche Two [Member] | Restricted Share Awards [Member] | Original Year of Issuance Date 2018 [Member]
Unvested Share Awards [Abstract]
Vesting schedule (in hundredths)	25.00%
Minimum [Member] | Share-based Compensation Award, Tranche Two [Member] | Restricted Share Awards [Member] | Original Year of Issuance Date 2015 [Member]
Unvested Share Awards [Abstract]
Vesting schedule (in hundredths)	25.00%
Minimum [Member] | Share-based Compensation Award, Tranche Three [Member] | Restricted Share Awards [Member] | Original Year of Issuance Date 2019 [Member]
Unvested Share Awards [Abstract]
Vesting schedule (in hundredths)	50.00%
Minimum [Member] | Share-based Compensation Award, Tranche Three [Member] | Restricted Share Awards [Member] | Original Year of Issuance Date 2018 [Member]
Unvested Share Awards [Abstract]
Vesting schedule (in hundredths)	25.00%
Minimum [Member] | Share-based Compensation Award, Tranche Three [Member] | Restricted Share Awards [Member] | Original Year of Issuance Date 2015 [Member]
Unvested Share Awards [Abstract]
Vesting schedule (in hundredths)	25.00%
Minimum [Member] | Share-Based Compensation Award, Tranche Four [Member] | Restricted Share Awards [Member] | Original Year of Issuance Date 2018 [Member]
Unvested Share Awards [Abstract]
Vesting schedule (in hundredths)	25.00%
Maximum [Member] | Restricted Share Awards [Member] | Original Year of Issuance Date 2019 [Member]
Unvested Share Awards [Abstract]
Share price on date of grant (in dollars per share)	$ 18.00
Vesting Period	2 years
Maximum [Member] | Restricted Share Awards [Member] | Original Year of Issuance Date 2018 [Member]
Unvested Share Awards [Abstract]
Share price on date of grant (in dollars per share)	$ 22.65
Vesting Period	4 years
Maximum [Member] | Restricted Share Awards [Member] | Original Year of Issuance Date 2017 [Member]
Unvested Share Awards [Abstract]
Share price on date of grant (in dollars per share)	$ 18.53
Maximum [Member] | Restricted Share Awards [Member] | Original Year of Issuance Date 2016 [Member]
Unvested Share Awards [Abstract]
Share price on date of grant (in dollars per share)	$ 21.11
Maximum [Member] | Restricted Share Awards [Member] | Original Year of Issuance Date 2015 [Member]
Unvested Share Awards [Abstract]
Vesting Period	4 years
Maximum [Member] | Share-based Compensation Award, Tranche One [Member] | Restricted Share Awards [Member] | Original Year of Issuance Date 2019 [Member]
Unvested Share Awards [Abstract]
Vesting schedule (in hundredths)	100.00%
Maximum [Member] | Share-based Compensation Award, Tranche One [Member] | Restricted Share Awards [Member] | Original Year of Issuance Date 2018 [Member]
Unvested Share Awards [Abstract]
Vesting schedule (in hundredths)	100.00%
Maximum [Member] | Share-based Compensation Award, Tranche One [Member] | Restricted Share Awards [Member] | Original Year of Issuance Date 2015 [Member]
Unvested Share Awards [Abstract]
Vesting schedule (in hundredths)	50.00%
Maximum [Member] | Share-based Compensation Award, Tranche Two [Member] | Restricted Share Awards [Member] | Original Year of Issuance Date 2019 [Member]
Unvested Share Awards [Abstract]
Vesting schedule (in hundredths)	100.00%
Maximum [Member] | Share-based Compensation Award, Tranche Two [Member] | Restricted Share Awards [Member] | Original Year of Issuance Date 2018 [Member]
Unvested Share Awards [Abstract]
Vesting schedule (in hundredths)	100.00%
Maximum [Member] | Share-based Compensation Award, Tranche Two [Member] | Restricted Share Awards [Member] | Original Year of Issuance Date 2015 [Member]
Unvested Share Awards [Abstract]
Vesting schedule (in hundredths)	50.00%
Maximum [Member] | Share-based Compensation Award, Tranche Three [Member] | Restricted Share Awards [Member] | Original Year of Issuance Date 2019 [Member]
Unvested Share Awards [Abstract]
Vesting schedule (in hundredths)	100.00%
Maximum [Member] | Share-based Compensation Award, Tranche Three [Member] | Restricted Share Awards [Member] | Original Year of Issuance Date 2018 [Member]
Unvested Share Awards [Abstract]
Vesting schedule (in hundredths)	100.00%
Maximum [Member] | Share-based Compensation Award, Tranche Three [Member] | Restricted Share Awards [Member] | Original Year of Issuance Date 2015 [Member]
Unvested Share Awards [Abstract]
Vesting schedule (in hundredths)	50.00%
Maximum [Member] | Share-Based Compensation Award, Tranche Four [Member] | Restricted Share Awards [Member] | Original Year of Issuance Date 2018 [Member]
Unvested Share Awards [Abstract]
Vesting schedule (in hundredths)	100.00%