Annual report pursuant to Section 13 and 15(d)

QUARTERLY FINANCIAL DATA (UNAUDITED) (Details)

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QUARTERLY FINANCIAL DATA (UNAUDITED) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract]                      
Revenue from Contract with Customer, Excluding Assessed Tax $ 425,414 $ 434,041 $ 459,888 $ 385,219 $ 313,712 $ 282,730 $ 213,492 $ 171,931      
Gross profit 124,993 113,895 108,000 87,097 51,664 57,297 36,715 22,366      
Net income $ 51,778 $ 46,285 $ 39,091 $ 36,708 $ 10,078 $ 21,965 $ 4,921 $ (24,351) $ 232,669 $ 24,113 $ (67,386)
NET INCOME (LOSS) PER COMMON SHARE:                      
Basic (in dollars per share) $ 0.62 $ 0.55 $ 0.47 $ 0.44 $ 0.12 $ 0.26 $ 0.06 $ (0.43) $ 2.08 $ 0.17 $ (1.19)
Diluted (in dollars per share) $ 0.59 $ 0.53 $ 0.45 $ 0.42 $ 0.12 $ 0.25 $ 0.06 $ (0.43) $ 2.00 $ 0.16 $ (1.19)
Weighted average common shares outstanding:                      
Basic (in shares) 83,758 83,544 83,447 83,081 83,040 83,040 83,040 55,996 83,460 76,371 44,787
Diluted (in shares) 87,218 86,878 86,878 86,848 86,818 86,264 86,279 55,996 87,046 79,583 44,787