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Leases (Notes) | 12 Months Ended
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Dec. 31, 2017
Leases [Abstract] |
Leases of Lessee Disclosure [Text Block] |
8. | Leases
We lease premises and certain equipment under cancelable and non-cancelable leases, some of which contain renewal options under various terms. Total rental expense for continuing operations associated with these operating leases was $1.7 million in 2017 and $1.5 million in 2016. During the fourth quarter of 2006, we entered into a 15-year lease in Atlanta, Georgia for 335,372 square feet (net of space which was surrendered to the landlord through our exercise of a termination option), 255,110 square feet of which we have subleased, and the remainder of which houses our corporate offices. In connection with this lease, we received a $21.2 million construction allowance for the build-out of our new corporate offices. We are amortizing the construction allowance as a reduction of rent expense over the term of the lease. As of December 31, 2017, the future minimum rental commitments (in thousands) for all non-cancelable operating leases with initial or remaining terms of more than one year (both gross and net of any sublease income) are as follows:
|  | Gross |  | Sublease Income |  | Net
2018 |  | $ | 9,865 |  |  | $ | (6,741 | ) |  | $ | 3,124 |
2019 |  | 9,783 |  |  | (6,930 | ) |  | 2,853 |
2020 |  | 9,808 |  |  | (7,126 | ) |  | 2,682 |
2021 |  | 9,832 |  |  | (7,327 | ) |  | 2,505 |
2022 |  | 4,157 |  |  | (3,117 | ) |  | 1,040 |
Thereafter |  | — |  |  | — |  |  | — |
Total |  | $ | 43,445 |  |  | $ | (31,241 | ) |  | $ | 12,204 |
In addition, we occasionally lease certain equipment under cancelable and non-cancelable leases, which are accounted for as capital leases in our consolidated financial statements. As of December 31, 2017, we had no material non-cancelable capital leases with initial or remaining terms of more than one year.

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- Definition The entire disclosure for lessee entity's leasing arrangements including, but not limited to, all of the following: (a.) The basis on which contingent rental payments are determined, (b.) The existence and terms of renewal or purchase options and escalation clauses, (c.) Restrictions imposed by lease agreements, such as those concerning dividends, additional debt, and further leasing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -URI http://asc.fasb.org/subtopic&trid=77888251 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -URI http://asc.fasb.org/topic&trid=2208923 + Details
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