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Equity Method Investments (Tables) | 12 Months Ended
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Dec. 31, 2017
Equity Method Investments and Joint Ventures [Abstract] |
Activity Related to Equity Method Investments | Activity related to these equity method investments is as follows:
|  | Constitution |  | Meade |  | Total
|  | Year Ended December 31, |  | Year Ended December 31, |  | Year Ended December 31,
(In thousands) |  | 2017 |  | 2016 |  | 2015 |  | 2017 |  | 2016 |  | 2015 |  | 2017 |  | 2016 |  | 2015
Balance at beginning of period |  | $ | 96,850 |  |  | $ | 90,345 |  |  | $ | 64,268 |  |  | $ | 32,674 |  |  | $ | 13,172 |  |  | $ | 3,761 |  |  | $ | 129,524 |  |  | $ | 103,517 |  |  | $ | 68,029 |
Contributions |  | 4,350 |  |  | 8,975 |  |  | 19,625 |  |  | 52,689 |  |  | 19,509 |  |  | 9,448 |  |  | 57,039 |  |  | 28,484 |  |  | 29,073 |
Earnings (loss) on equity method investments |  | (100,468 | ) |  | (2,470 | ) |  | 6,452 |  |  | (18 | ) |  | (7 | ) |  | (37 | ) |  | (100,486 | ) |  | (2,477 | ) |  | 6,415 |
Balance at end of period |  | $ | 732 |  |  | $ | 96,850 |  |  | $ | 90,345 |  |  | $ | 85,345 |  |  | $ | 32,674 |  |  | $ | 13,172 |  |  | $ | 86,077 |  |  | $ | 129,524 |  |  | $ | 103,517 |

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- Definition Tabular disclosure of equity method investments including, but not limited to, name of each investee or group of investments, percentage ownership, difference between recorded amount of an investment and the value of the underlying equity in the net assets, and summarized financial information. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=66011266&loc=d3e33918-111571 + Details
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