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Summary of Significant Accounting Policies Cash, Cash Equivalent, and Restricted Cash (Tables) | 12 Months Ended
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Dec. 31, 2017
Cash and Cash Equivalents [Abstract] |
Restrictions on Cash and Cash Equivalents [Table Text Block] | The following table provides a reconciliation of cash, cash equivalents, and restricted cash reported within the Consolidated Balance Sheets that sum to the total of the same such amounts shown in the Consolidated Statements of Cash Flows:
| Year Ended December 31,
| 2017 |  | 2016 |  | 2015
| (in thousands)
Cash and cash equivalents | $ | 176,274 |  |  | $ | 133,565 |  |  | $ | 131,018 |
Current restricted cash included in other current assets | 51 |  |  | — |  |  | — |
Long-term restricted cash | 311,010 |  |  | — |  |  | — |
Total cash, cash equivalents, and restricted cash: | $ | 487,335 |  |  | $ | 133,565 |  |  | $ | 131,018 |

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- Definition Tabular disclosure of cash and cash equivalents restricted as to withdrawal or usage. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(2)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(1)(a)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=98513485&loc=SL98516268-108586 + Details
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