Quarterly report pursuant to Section 13 or 15(d)

Note 1 - Basis of Presentation and Accounting Policies - Deferred Gain Activity (Details)

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Note 1 - Basis of Presentation and Accounting Policies - Deferred Gain Activity (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Balance at beginning of period $ 25,006 $ 33,910
Amortization of deferred gains included in operating expenses as a reduction to rental expense (4,019) (4,099)
Other adjustments (250) (364)
Balance at end of period $ 20,737 $ 29,447