Annual report pursuant to Section 13 and 15(d)

Accumulated Other Comprehensive Income (Loss) - Summary of Changes in Accumulated Other Comprehensive Income (Loss) (Details)

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Accumulated Other Comprehensive Income (Loss) - Summary of Changes in Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance $ 823,116 $ 786,760 $ 725,164
Other comprehensive income (loss) before reclassifications (3,581)    
Amounts reclassified out of accumulated other comprehensive income (loss) (2,714)    
Other comprehensive income (loss) (6,295) 2,926 3,569
Ending Balance 944,764 823,116 786,760
Other comprehensive income (loss) before reclassifications, tax expense (836)    
Tax benefit associated with change in pension actuarial loss 734    
Amounts reclassified out of accumulated other comprehensive income (loss), tax expense (1,108)    
Gains and (Losses) on Cash Flow Hedges      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance 3,034    
Other comprehensive income (loss) before reclassifications (1,646)    
Amounts reclassified out of accumulated other comprehensive income (loss) (2,714)    
Other comprehensive income (loss) (4,360)    
Ending Balance (1,326) 3,034  
Defined Benefit Pension Plan      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance 1,199    
Other comprehensive income (loss) before reclassifications (1,935)    
Amounts reclassified out of accumulated other comprehensive income (loss) 0    
Other comprehensive income (loss) (1,935)    
Ending Balance (736) 1,199  
Accumulated Other Comprehensive Income (Loss)      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance 4,233 1,307 (2,262)
Ending Balance $ (2,062) $ 4,233 $ 1,307