Annual report pursuant to Section 13 and 15(d)

Comprehensive Income (Loss) (Details)

v3.8.0.1
Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning Balance $ 384,763 $ 326,452 $ 328,780
Ending Balance 501,875 384,763 326,452
Foreign Currency      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning Balance (589) (546) (209)
Other comprehensive loss, net     (337)
Other comprehensive income, net 55 (43)  
Reclassification into earnings 0 0  
Income tax provision 0 0  
Ending Balance (534) (589) (546)
Swap Agreements      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning Balance 536 0 0
Other comprehensive loss, net     0
Other comprehensive income, net 427 720  
Reclassification into earnings (141) 226  
Income tax provision (45) (410)  
Ending Balance 777 536 0
Accumulated Other Comprehensive Loss      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning Balance (53) (546) (209)
Other comprehensive loss, net     (337)
Other comprehensive income, net 482 677  
Reclassification into earnings (141) 226  
Income tax provision (45) (410)  
Ending Balance $ 243 $ (53) $ (546)