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Other Comprehensive Income (Loss) - Derivative Instruments Included in Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance $ 191,542 $ 181,321
Other comprehensive income (loss) 3,050 (2,933)
Ending balance 197,787 181,372
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance 1,438 1,544
Unrealized gains (losses) arising during the period (589) 486
Related deferred taxes 124 (102)
Other comprehensive income (loss) (465) 384
Ending balance $ 973 $ 1,928