Annual report pursuant to Section 13 and 15(d)

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

v3.10.0.1
Accumulated Other Comprehensive Income (Loss) - Summary of Changes in Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance $ 786,760 $ 725,164 $ 729,048
Other comprehensive income (loss) before reclassifications 3,159    
Amounts reclassified out of accumulated other comprehensive income (loss) (233)    
Other comprehensive income (loss) 2,926 3,569 3,370
Ending Balance 823,116 786,760 725,164
Other comprehensive income (loss) before reclassifications, tax expense 548    
Tax benefit associated with change in pension actuarial loss 726    
Amounts reclassified out of accumulated other comprehensive income (loss), tax expense 88    
Gains and (Losses) on Cash Flow Hedges      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance 1,750    
Other comprehensive income (loss) before reclassifications 1,517    
Amounts reclassified out of accumulated other comprehensive income (loss) (233)    
Other comprehensive income (loss) 1,284    
Ending Balance 3,034 1,750  
Defined Benefit Pension Plan      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance (443)    
Other comprehensive income (loss) before reclassifications 1,642    
Amounts reclassified out of accumulated other comprehensive income (loss) 0    
Other comprehensive income (loss) 1,642    
Ending Balance 1,199 (443)  
Accumulated Other Comprehensive Income (Loss)      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance 1,307 (2,262) (5,632)
Ending Balance 4,233 1,307 (2,262)
Tax benefit associated with change in pension actuarial loss $ (726) $ (163) $ (112)