Equity - Schedule of Changes in AOCI (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Changes in Accumulated Other Comprehensive Income
Balance at beginning of period	$ 1,340,835	$ 1,412,491
Balance at end of period	1,346,678	1,340,835
Accumulated Other Comprehensive Income (Loss) [Member]
Changes in Accumulated Other Comprehensive Income
Balance at beginning of period	1,065	(1,033)
Balance at end of period	76	1,065
Accumulated Net Gain (Loss) from Cash Flow Hedges Including Portion Attributable to Noncontrolling Interest [Member]
Changes in Accumulated Other Comprehensive Income
Other comprehensive income before reclassifications	597	1,168
Amounts of (income) loss reclassified from accumulated other comprehensive income (loss) to interest expense	$ (1,586)	$ 930