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Basis of Presentation (Textual) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Dec. 31, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Basis Of Presentation [Line Items] |  |  |
Shares used for employee taxes upon vesting of share awards |  | $ 674 | $ 879
ASU 2016-09 [Member] | Reclassified from Operating Activities to Financing Activities [Member] |  |  |
Basis Of Presentation [Line Items] |  |  |
Shares used for employee taxes upon vesting of share awards |  |  | 900
ASU 2016-15 [Member] | Reclassified from Operating Activities to Financing Activities [Member] |  |  |
Basis Of Presentation [Line Items] |  |  |
Debt prepayment costs |  |  | $ 53,400
Impairment Charges [Member] |  |  |
Basis Of Presentation [Line Items] |  |  |
Out-of-period error immaterial in current year | $ 1,200 |  |

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- Definition Amount of cash outflow for cost from early extinguishment and prepayment of debt. Includes, but is not limited to, third-party cost, premium paid, and other fee paid to lender directly for debt extinguishment or debt prepayment. Excludes accrued interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3291-108585 + Details
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