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Basis of Presentation (Textual) (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2017 | Mar. 31, 2016
Basis Of Presentation [Line Items] |  |
Shares used for employee taxes upon vesting of share awards | $ 129 | $ 289
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 |  | 300
ASU 2016-15 [Member] | Reclassified from Operating Activities to Financing Activities [Member] |  |
Basis Of Presentation [Line Items] |  |
Debt prepayment costs |  | $ 53,400

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