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Available-for-sale securities | 6 Months Ended
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Jun. 30, 2016
Investments, Debt and Equity Securities [Abstract] |
Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block] | Available-for-Sale Securities Available-for-sale securities consist of investments held by the Company's wholly-owned captive insurance subsidiary, which is required to maintain statutory minimum capital and surplus; therefore its access to these securities may be limited. Available-for-sale securities are included in other assets in the accompanying Consolidated Balance Sheets.
| June 30, 2016
(in thousands) | Amortized Cost |  | Gains in Accumulated Other Comprehensive Loss |  | Losses in Accumulated Other Comprehensive Loss |  | Estimated Fair Value
Certificates of deposit | $ | 250 |  |  | 8 |  |  | — |  |  | 258 |
Corporate bonds | 7,746 |  |  | — |  |  | (14 | ) |  | 7,732 |
Total | $ | 7,996 |  |  | 8 |  |  | (14 | ) |  | 7,990 |
(in thousands) | December 31, 2015
| Amortized Cost |  | Gains in Accumulated Other Comprehensive Loss |  | Losses in Accumulated Other Comprehensive Loss |  | Estimated Fair Value
Certificates of deposit | $ | 1,500 |  |  | 1 |  |  | — |  |  | 1,501 |
Corporate bonds | 6,465 |  |  | — |  |  | (44 | ) |  | 6,421 |
| $ | 7,965 |  |  | 1 |  |  | (44 | ) |  | 7,922 |
Realized gains or losses on investments are recorded in the Company's consolidated statements of operations within net investment income. Upon the sale of a security classified as available-for-sale prior to its maturity, the security’s specific unrealized gain (loss) is reclassified out of accumulated other comprehensive loss into earnings. During the six months ended June 30, 2016 and 2015, there were no such reclassifications from accumulated other comprehensive loss into earnings. The contractual maturities of available-for-sale securities were as follows:
| June 30, 2016
(in thousands) | Less than 12 months |  | 1-3 Years |  | Over 3 Years |  | Total
Certificates of deposit | $ | — |  |  | — |  |  | 258 |  |  | 258 |
Corporate bonds | 1,004 |  |  | 4,881 |  |  | 1,847 |  |  | 7,732 |
Total | $ | 1,004 |  |  | 4,881 |  |  | 2,105 |  |  | 7,990 |

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- Definition The entire disclosure for investments in certain debt and equity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -Glossary Debt Security -URI http://asc.fasb.org/extlink&oid=6509901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -Glossary Equity Security -URI http://asc.fasb.org/extlink&oid=6511694 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62557-112803 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27405-111563 + Details
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