Equity - Schedule of Changes in AOCI (Details) - Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Changes in Accumulated Other Comprehensive Income
Balance at beginning of period	$ (1,033)	$ (1,939)
Other comprehensive income (loss) before reclassifications	1,168	(3,084)
Amounts of loss reclassified from accumulated other comprehensive income to interest expense	930	3,990
Balance at end of period	$ 1,065	$ (1,033)