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OTHER FINANCIAL INFORMATION - CONDENSED CONSOLIDATED STATEMENT OF CASH FLOWS (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Condensed Financial Information      
Net cash (used) provided by operating activities $ 149,122 $ 300,235 $ 283,049
Investing Activities:      
Capital expenditures (21,507) (17,957) (21,658)
Payments to Acquire Businesses, Net of Cash Acquired 0 (50,890) (151,595)
Proceeds from sale of assets 6,766 8,361 3,023
Advances to subsidiaries and other 9,446 (10,000) 0
Net cash used in investing activities (5,295) (70,486) (170,230)
Financing Activities:      
Other 6,722 (4,570) (2,089)
Net cash provided (used) by financing activities (141,196) (276,263) (67,815)
Effect of exchange rate changes on cash and cash equivalents 5,191 (3,634) (13,044)
Net change in cash and cash equivalents 7,822 (50,148) 31,960
Cash and cash equivalents at the beginning of period 110,131 160,279 128,319
Cash and cash equivalents at the end of period 117,953 110,131 160,279
Parent Company      
Condensed Financial Information      
Net cash (used) provided by operating activities (36,575) 95,388 3,531
Investing Activities:      
Capital expenditures 0 0 0
Payments to Acquire Businesses, Net of Cash Acquired   0 0
Proceeds from sale of assets 0 0 0
Proceeds from Dividends Received 0 0 0
Payments for Advance to Affiliate 0 0 0
Net cash used in investing activities 0 0 0
Financing Activities:      
Proceeds from Issuance of Debt 143,367 252,246 150,705
Repayments of Debt 0 (344,804) 0
Equity transactions (106,792) (2,830) (154,236)
Cash Dividends Paid to Parent Company 0 0 0
Other 0 0 0
Net cash provided (used) by financing activities 36,575 (95,388) (3,531)
Effect of exchange rate changes on cash and cash equivalents 0 0 0
Net change in cash and cash equivalents 0 0 0
Cash and cash equivalents at the beginning of period 0 0 0
Cash and cash equivalents at the end of period 0 0 0
Guarantor Subsidiaries      
Condensed Financial Information      
Net cash (used) provided by operating activities 101,826 (243,476) 214,037
Investing Activities:      
Capital expenditures (13,215) (12,482) (15,266)
Payments to Acquire Businesses, Net of Cash Acquired   (50,890) (151,595)
Proceeds from sale of assets 0 0 0
Proceeds from Dividends Received 307,784 82,912 114,101
Payments for Advance to Affiliate 383,686 297,259 197,345
Net cash used in investing activities (89,117) (277,719) (250,105)
Financing Activities:      
Proceeds from Issuance of Debt 775,926 1,566,864 1,224,596
Repayments of Debt (785,392) (1,030,520) (1,175,056)
Equity transactions 0 0 0
Cash Dividends Paid to Parent Company 0 0 0
Other 5,807 (12,560) (7,017)
Net cash provided (used) by financing activities (3,659) 523,784 42,523
Effect of exchange rate changes on cash and cash equivalents 0 0 0
Net change in cash and cash equivalents 9,050 2,589 6,455
Cash and cash equivalents at the beginning of period 41,552 38,963 32,508
Cash and cash equivalents at the end of period 50,602 41,552 38,963
Non-Guarantor Subsidiaries      
Condensed Financial Information      
Net cash (used) provided by operating activities 83,871 448,323 65,481
Investing Activities:      
Capital expenditures (8,292) (5,475) (6,392)
Payments to Acquire Businesses, Net of Cash Acquired   0 0
Proceeds from sale of assets 6,766 8,361 3,023
Proceeds from Dividends Received 0 0 0
Payments for Advance to Affiliate (26,912) 337,344 (17,461)
Net cash used in investing activities 25,386 (334,458) 14,092
Financing Activities:      
Proceeds from Issuance of Debt 1,144,848 672,345 452,655
Repayments of Debt (952,740) (752,401) (379,578)
Equity transactions 0 0 0
Cash Dividends Paid to Parent Company (307,784) (82,912) (114,101)
Other 0 0 0
Net cash provided (used) by financing activities (115,676) (162,968) (41,024)
Effect of exchange rate changes on cash and cash equivalents 5,191 (3,634) (13,044)
Net change in cash and cash equivalents (1,228) (52,737) 25,505
Cash and cash equivalents at the beginning of period 68,579 121,316 95,811
Cash and cash equivalents at the end of period 67,351 68,579 121,316
Consolidated Entities [Member]      
Condensed Financial Information      
Net cash (used) provided by operating activities 149,122 300,235 283,049
Investing Activities:      
Capital expenditures (21,507) (17,957) (21,658)
Payments to Acquire Businesses, Net of Cash Acquired   (50,890) (151,595)
Proceeds from sale of assets 6,766 8,361 3,023
Proceeds from Dividends Received 0 0 0
Payments for Advance to Affiliate (9,446) 10,000 0
Net cash used in investing activities (5,295) (70,486) (170,230)
Financing Activities:      
Proceeds from Issuance of Debt 1,680,455 2,194,196 1,630,611
Repayments of Debt (1,720,666) (2,455,069) (1,537,173)
Equity transactions (106,792) (2,830) (154,236)
Cash Dividends Paid to Parent Company 0 0 0
Other 5,807 (12,560) (7,017)
Net cash provided (used) by financing activities (141,196) (276,263) (67,815)
Effect of exchange rate changes on cash and cash equivalents 5,191 (3,634) (13,044)
Net change in cash and cash equivalents 7,822 (50,148) 31,960
Cash and cash equivalents at the beginning of period 110,131 160,279 128,319
Cash and cash equivalents at the end of period 117,953 110,131 160,279
Consolidation, Eliminations      
Condensed Financial Information      
Net cash (used) provided by operating activities 0 0 0
Investing Activities:      
Capital expenditures 0 0 0
Payments to Acquire Businesses, Net of Cash Acquired   0 0
Proceeds from sale of assets 0 0 0
Proceeds from Dividends Received (307,784) (82,912) (114,101)
Payments for Advance to Affiliate (366,220) (624,603) (179,884)
Net cash used in investing activities 58,436 541,691 65,783
Financing Activities:      
Proceeds from Issuance of Debt (383,686) (297,259) (197,345)
Repayments of Debt 17,466 (327,344) 17,461
Equity transactions 0 0 0
Cash Dividends Paid to Parent Company 307,784 82,912 114,101
Other 0 0 0
Net cash provided (used) by financing activities (58,436) (541,691) (65,783)
Effect of exchange rate changes on cash and cash equivalents 0 0 0
Net change in cash and cash equivalents 0 0 0
Cash and cash equivalents at the beginning of period 0 0 0
Cash and cash equivalents at the end of period $ 0 $ 0 $ 0