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Summary of Significant Accounting Policies (Tables) | 9 Months Ended
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Sep. 30, 2018
Accounting Policies [Abstract] |
Schedule of Impact on Financial Statements from Adopting New Accounting Guidance | The following table illustrates changes in the Company’s cash flows as reported and as previously reported prior to the adoption of the Cash Flow ASUs during the fourth quarter of 2017 (in thousands):
|  | Nine Months Ended September 30, 2017
|  | As Reported |  | As Previously Reported
Net cash provided by (used in) investing activities |  | $ | 1,740,698 |  |  | $ | 1,755,823 |
Net increase (decrease) in balance(1) |  | 24,032 |  |  | 39,157 |
Balance - beginning of period(1) |  | 136,990 |  |  | 94,730 |
Balance - end of period(1) |  | 161,022 |  |  | 133,887 |
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(1) | Amounts in the As Reported column include cash and cash equivalents and restricted cash as required upon the adoption of the Cash Flow ASUs. Amounts in the As Previously Reported column reflect only cash and cash equivalents.

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- Definition Tabular disclosure of changes in accounting principles, including adoption of new accounting pronouncements, that describes the new methods, amount and effects on financial statement line items. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=109234566&loc=d3e22499-107794 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=109236672&loc=d3e765-108305 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.10-01.(b)(6)) -URI http://asc.fasb.org/extlink&oid=27015980&loc=d3e46468-122699 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109234566&loc=d3e22580-107794 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=109236672&loc=d3e725-108305 Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=109234566&loc=d3e22583-107794 + Details
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