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Fair Value Measurement (Notes) | 12 Months Ended
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Dec. 31, 2015
Fair Value Measurement [Abstract] |
Fair Value Disclosures [Text Block] | Fair Value Measurement Our investment securities consist of certificates of deposit, corporate bonds, U.S. Treasury securities, commercial paper and federal tax-exempt state and municipal government debt. All investment securities are considered available-for-sale and are "investment grade", carried at fair value and there have been no gains or losses on their disposal. As of December 31, 2015, we have $8.8 million of investment securities as Level 1 assets, which are certificates of deposit and U.S. Treasury securities with quoted prices in active markets. As of December 31, 2015, we have $32.4 million of investment securities as Level 2 assets, which are pre-refunded municipal securities, non-pre-refunded municipal securities, commercial paper and corporate bonds and are valued using observable market based inputs such as quoted prices, interest rates and yield curves. There were no transfers between levels in 2015. The following table provides the assets and liabilities carried at fair value measured on a recurring basis.
| Fair value measurements at December 31, 2015 using
| Total carrying value |  | Quoted prices in active markets for identical assets (level 1) |  | Significant other observable inputs (level 2) |  | Significant unobservable inputs (level 3)
Available for sale securities | $ | 41,233 |  |  | $ | 8,785 |  |  | $ | 32,448 |  |  | $ | — |
| $ | 41,233 |  |  | $ | 8,785 |  |  | $ | 32,448 |  |  | $ | — |
| Fair value measurements at December 31, 2014 using
| Total carrying value |  | Quoted prices in active markets for identical assets (level 1) |  | Significant other observable inputs (level 2) |  | Significant unobservable inputs (level 3)
Available for sale securities | $ | 70,952 |  |  | $ | 5,884 |  |  | $ | 65,068 |  |  | $ | — |
| $ | 70,952 |  |  | $ | 5,884 |  |  | $ | 65,068 |  |  | $ | — |
As of December 31, 2015, the carrying amounts of assets held for sale, as Level 3 assets, were written-down to their fair value of $4.1 million based upon the expected sales price less costs to sell, as determined by property appraisal reports prepared by an independent real estate appraiser. Our assets held for sale are included as a separate line item in our consolidated balance sheets. The estimated fair value of the assets held for sale was developed using the income approach and is based on critical estimates, judgments and assumptions derived from: analysis of market conditions; building condition; comparable properties; and rental income and expense. As a result of the fair value estimate, during 2015, we incurred a $4.1 million impairment on these assets, included as a separate line item in our consolidated statements of income within income from operations. The following table provides the assets and liabilities carried at fair value measured on a non-recurring basis.
| Fair value measurements at December 31, 2015 using
| Total carrying value |  | Quoted prices in active markets for identical assets (level 1) |  | Significant other observable inputs (level 2) |  | Significant unobservable inputs (level 3)
Assets held for sale | 4,134 |  |  | — |  |  | — |  |  | 4,134 |
| $ | 4,134 |  |  | $ | — |  |  | $ | — |  |  | $ | 4,134 |

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- Definition Fair Value Measurement [Abstract] + References No definition available. + Details
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- Definition The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 30 -URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14172-108612 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14064-108612 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13537-108611 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13504-108611 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13433-108611 + Details
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