Commitments and contingencies (Tables) |
12 Months Ended | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Dec. 31, 2018 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Commitments and Contingencies Disclosure [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Schedule of future minimum lease obligations under non-cancelable ground and other operating leases | Our rental expense attributable to continuing operations for the years ended December 31, 2018, 2017, and 2016, was approximately $15.8 million, $14.0 million, and $14.3 million, respectively. These rental expense amounts include certain operating leases for our headquarters and field offices and ground leases for 29 of our properties. Ground leases generally require fixed annual rent payments and may also include escalation clauses and renewal options. Future minimum lease obligations under non-cancelable ground and other operating leases as of December 31, 2018, were as follows (in thousands):
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