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Recently Issued Accounting Standards Recently Issued Accounting Standards (Details) - USD ($) $ in Thousands | 6 Months Ended
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Jun. 30, 2018 | Jun. 30, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Increase (decrease) in restricted cash and cash equivalents, operating activities |  |  | $ 0
Increase (decrease) in restricted cash and cash equivalents, investing activities |  |  | 0
Increase (decrease) in restricted cash and cash equivalents, financing activities |  |  | 0
Net increase in cash, cash equivalents and restricted cash | [1] | $ 214,708 | 141,379
Cash, cash equivalents and restricted cash at beginning of period | [1] | 612,677 | 640,218
Cash, cash equivalents and restricted cash at end of period | [1] | $ 827,385 | 781,597
Accounting Standards Update 2016-18 [Member] | Previously Reported |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Increase (decrease) in restricted cash and cash equivalents, operating activities |  |  | (406)
Increase (decrease) in restricted cash and cash equivalents, investing activities |  |  | (6,544)
Increase (decrease) in restricted cash and cash equivalents, financing activities |  |  | (15,393)
Net increase in cash, cash equivalents and restricted cash |  |  | 119,036
Cash, cash equivalents and restricted cash at beginning of period |  |  | 224,190
Cash, cash equivalents and restricted cash at end of period |  |  | 343,226
Accounting Standards Update 2016-18 [Member] | Restatement Adjustment |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Increase (decrease) in restricted cash and cash equivalents, operating activities |  |  | 406
Increase (decrease) in restricted cash and cash equivalents, investing activities |  |  | 6,544
Increase (decrease) in restricted cash and cash equivalents, financing activities |  |  | 15,393
Net increase in cash, cash equivalents and restricted cash |  |  | 22,343
Cash, cash equivalents and restricted cash at beginning of period |  |  | 416,028
Cash, cash equivalents and restricted cash at end of period |  |  | $ 438,371
[1] | Following the adoption of the amendments to ASC 230, the statement of cash flows presents the change in the period in total cash, cash equivalents and restricted cash. These amendments have been applied retrospectively for the six months ended June 30, 2017.

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- Definition Amount of cash and cash equivalents, and cash and cash equivalents restricted to withdrawal or usage. Excludes amount for disposal group and discontinued operations. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3521-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3044-108585 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -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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