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Valuation and Qualifying Accounts (Tables) | 12 Months Ended
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Dec. 31, 2016
Valuation and Qualifying Accounts [Abstract] |
Summary of Valuation Allowance [Table Text Block] |
Description |  | Balance at Beginning of Period |  | Other Adjustments |  | Additions Charged to Costs and Expenses |  | Balance at End of Period, Noncurrent
|  | (in thousands)
Year ended December 31, 2016: |  |  |  |  |  |  |  |
Deferred tax assets valuation allowance |  | $ | 235,339 |  |  | $ | (12,419 | ) |  | $ | 26,640 |  |  | $ | 249,560 |
Year ended December 31, 2015: |  |  |  |  |  |  |  |
Deferred tax assets valuation allowance |  | $ | 257,728 |  |  | $ | (62,791 | ) |  | $ | 40,402 |  |  | $ | 235,339 |
Year ended December 31, 2014: |  |  |  |  |  |  |  |
Deferred tax assets valuation allowance |  | $ | 162,588 |  |  | $ | (4,913 | ) |  | $ | 100,053 |  |  | $ | 257,728 |

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- Definition Tabular disclosure of valuation allowances to reduce deferred tax assets to net realizable value, including identification of the deferred tax asset more likely than not will not be fully realized and the corresponding amount of the valuation allowance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Valuation Allowance -URI http://asc.fasb.org/extlink&oid=6528051 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32537-109319 + Details
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- References No definition available. + Details
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