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Note 1 - Summary of Significant Accounting Policies (Details Textual) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 USD ($) shares | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Real Estate Under Development Period After Completion Cessation of Cost Capitalization | 1 year |  |
Financing Receivable Past Due Term | 90 days |  |
Number of Portfolio Segments | 1 |  |
Capitalized Computer Software, Net | $ 6,200 | $ 10,200 |
Capitalized Computer Software, Amortization | 4,600 | 8,000 | $ 10,700
Amount of Ineffectiveness on Net Investment Hedges | $ 0 | $ 0 | $ 0
Number of Equity Participation Plans | 2 |  |
Fee Income as a Percentage of Revenue | 3.00% | 3.00% |
Available-for-sale Securities, Accumulated Gross Unrealized Gain (Loss), before Tax | $ (1,136) | $ 406 |
Employee Stock Option [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period | 10 years |  |
Restricted Stock [Member] | Share-based Compensation Award, Vesting on Fourth or Fifth Anniversary [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage | 100.00% |  |
Restricted Stock [Member] | Share-based Compensation Award, Tranche One [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period | 3 years |  |
Restricted Stock [Member] | Share-based Compensation Award, Tranche Two [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period | 4 years |  |
Restricted Stock [Member] | Share-based Compensation Award, Tranche Three [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period | 5 years |  |
Restricted Stock [Member] | Share-based Compensation Award, Vesting After the Fifth Anniversary [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period | 10 years |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage | 20.00% |  |
Prior Plan [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized | shares | 47,000,000 |  |
The 2010 Plan [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized | shares | 10,000,000 |  |
After Issuance [Member] |  |  |
Redeemable Noncontrolling Units Redemption Period | 1 year |  |
Billed Accounts Receivable [Member] |  |  |
Allowance for Doubtful Accounts Receivable | $ 9,200 | 12,300 |
Straight-line Rent Receivable [Member] |  |  |
Allowance for Doubtful Accounts Receivable | $ 7,900 | $ 11,900 |
Minimum [Member] | Employee Stock Option [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period | 3 years |  |
Minimum [Member] | Performance Shares [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period | 1 year |  |
Minimum [Member] | Computer Software, Intangible Asset [Member] |  |  |
Finite-Lived Intangible Asset, Useful Life | 3 years |  |
Maximum [Member] | Employee Stock Option [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period | 5 years |  |
Maximum [Member] | Performance Shares [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period | 3 years |  |
Maximum [Member] | Computer Software, Intangible Asset [Member] |  |  |
Finite-Lived Intangible Asset, Useful Life | 5 years |  |
Building and Building Improvements [Member] | Minimum [Member] |  |  |
Property, Plant and Equipment, Useful Life | 15 years |  |
Building and Building Improvements [Member] | Maximum [Member] |  |  |
Property, Plant and Equipment, Useful Life | 50 years |  |

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