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Basis of Presentation (Textual) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Mar. 31, 2017 | Jun. 30, 2017 | Jun. 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 |  |  |  | 879
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 adjustment |  | $ 1,200 | 1,200 |
Depreciation Expense Relating To Write Off [Member] | Tenant Improvement Assets [Member] |  |  |  |
Basis Of Presentation [Line Items] |  |  |  |
Out-of-period adjustment | $ 1,900 |  | $ 1,900 |

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