Equity (Details Textual) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended	6 Months Ended
	Jan. 31, 2015	Jun. 30, 2015
EQUITY (Textual) [Abstract]
Employee Stock Purchase Plan shares issued during period		9,145
Shares of vested stock awards sold back to satisfy tax obligations		62,142
Outstanding unvested equity compensation awards		413,000
Additional equity compensation awards that could vest if certain targets are achieved		171,000
Shares issued based on unit distribution rights vested during period	1,793
Equity compensation awards granted during the period		151,588
Weighted average grant date fair value of equity awards granted during the period		$ 88.23
Income tax expense, related to change in benefit plans		$ 5
Other Comprehensive Income (Loss), Foreign Currency Translation Gain (Loss) Arising During Period, Tax		$ (2,229)
Stock Compensation Plan [Member]
EQUITY (Textual) [Abstract]
Vested common stock		181,517
Cash settled UUD [Member]
EQUITY (Textual) [Abstract]
Unvested Dividend Equivalent Value		$ 307