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Equity - Changes in Other Comprehensive Income (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]    
Beginning Balance $ 1,412,491 $ 1,462,531
Ending Balance 1,429,994 1,463,207
AOCI Attributable to Parent [Member]    
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]    
Beginning Balance (1,033) (1,939)
Ending Balance 259 (6,564)
Accumulated Net Gain (Loss) from Cash Flow Hedges Including Portion Attributable to Noncontrolling Interest [Member]    
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]    
Other comprehensive income (loss) before reclassifications 688 (5,691)
Amounts of loss reclassified from accumulated other comprehensive income to interest expense $ 604 $ 1,066