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