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, 2021
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Quarterly Financial Information Disclosure [Abstract]                      
Revenue - Service revenue $ 246,070 $ 250,099 $ 216,887 $ 161,458 $ 154,344 $ 133,710 $ 106,109 $ 395,069 $ 874,514 $ 789,232 $ 2,052,314
Gross profit 58,709 61,409 54,050 38,080 38,698 34,118 37,916 94,221      
Net income $ (20,232) $ (5,067) $ (8,511) $ (20,375) $ (44,112) $ (29,184) $ (25,920) $ (7,804) $ (54,185) $ (107,020) $ 163,010
Net income per common share:                      
Basic (in dollars per share) $ (0.20) $ (0.05) $ (0.08) $ (0.20) $ (0.44) $ (0.29) $ (0.26) $ (0.08) $ (0.53) $ (1.06) $ 1.62
Diluted (in dollars per share) $ (0.20) $ (0.05) $ (0.08) $ (0.20) $ (0.44) $ (0.29) $ (0.26) $ (0.08) $ (0.53) $ (1.06) $ 1.57
Weighted average common shares outstanding:                      
Basic (in shares) 103,390 103,257 102,398 101,550 100,911 100,897 100,821 100,687 102,655 100,829 100,472
Diluted (in shares) 103,390 103,257 102,398 101,550 100,911 100,897 100,821 100,687 102,655 100,829 103,750
Revenue from Contract with Customer, Product and Service [Extensible List]                 Service [Member] Service [Member] Service [Member]