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Supplemental Guarantor Information Condensed Consolidated Statements of Cash Flows (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Dec. 31, 2016
Condensed Financial Statements, Captions [Line Items]        
Net Cash Provided by (Used in) Operating Activities, Continuing Operations $ 15,541 $ 43,936    
Cash Provided by (Used in) Operating Activities, Discontinued Operations (2,690) 11,335    
Cash provided by (used in) operating activities 12,851 55,271    
Capital expenditures (42,345) (23,591)    
Proceeds from the sale of assets 60 15,019    
Purchase of short term investments and equity securities (361) (1,016)    
Sales and maturities of short-term investments 1,619 10,020    
Payments for (Proceeds from) Other Investing Activities (65) (14)    
Payments to Acquire Interest in Subsidiaries and Affiliates 0 0    
Net Cash Provided by (Used in) Investing Activities, Continuing Operations (41,092) 418    
Cash Provided by (Used in) Investing Activities, Discontinued Operations (28,470) (388)    
CASH USED IN INVESTING ACTIVITIES (69,562) 30    
Proceeds from Issuance of Unsecured Debt 15,000 0    
Repayments of Long-term Debt, Long-term Capital Lease Obligations, and Capital Securities (18,449) (3,206)    
Proceeds From Repayment Intercompany Borrowings 0 0    
Proceeds from (Payments for) Other Financing Activities (4,606) (3,247)    
Net Cash Provided by (Used in) Financing Activities, Continuing Operations (8,055) (6,453)    
Cash Provided by (Used in) Financing Activities, Discontinued Operations (22) (20)    
Net Cash Provided by (Used in) Financing Activities (8,077) (6,473)    
Effect of exchange rate changes on cash and cash equivalents 557 555    
Net Cash Provided by (Used in) Discontinued Operations (32,930) 5,527    
CashAndCashEquivalentsPeriodIncreaseDecreaseExcludingNetCashProvidedByUsedInDiscontinuedOperationsAssetsHeldForSale (31,301) 43,856    
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents 172,101 170,457 $ 203,402 $ 126,601
Parent Company [Member]        
Condensed Financial Statements, Captions [Line Items]        
Net Cash Provided by (Used in) Operating Activities, Continuing Operations (7,938) (4,815)    
Cash Provided by (Used in) Operating Activities, Discontinued Operations 0 0    
Cash provided by (used in) operating activities (7,938) (4,815)    
Capital expenditures (83) (319)    
Proceeds from the sale of assets 0 8,916    
Purchase of short term investments and equity securities (361) (1,016)    
Sales and maturities of short-term investments 1,067 9,157    
Payments for (Proceeds from) Other Investing Activities 0 46    
Payments to Acquire Interest in Subsidiaries and Affiliates (4,162) (12,454)    
Net Cash Provided by (Used in) Investing Activities, Continuing Operations (3,539) 4,330    
Cash Provided by (Used in) Investing Activities, Discontinued Operations 0 0    
CASH USED IN INVESTING ACTIVITIES (3,539) 4,330    
Proceeds from Issuance of Unsecured Debt 15,000      
Repayments of Long-term Debt, Long-term Capital Lease Obligations, and Capital Securities 0 0    
Proceeds From Repayment Intercompany Borrowings 20,381 (14,318)    
Proceeds from (Payments for) Other Financing Activities (4,606) (3,247)    
Net Cash Provided by (Used in) Financing Activities, Continuing Operations (9,987) 11,071    
Cash Provided by (Used in) Financing Activities, Discontinued Operations 0 0    
Net Cash Provided by (Used in) Financing Activities (9,987) 11,071    
Effect of exchange rate changes on cash and cash equivalents 0 0    
Net Cash Provided by (Used in) Discontinued Operations 0 0    
CashAndCashEquivalentsPeriodIncreaseDecreaseExcludingNetCashProvidedByUsedInDiscontinuedOperationsAssetsHeldForSale (21,464) 10,586    
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents 34,569 76,923 56,033 66,337
Guarantor Subsidiaries        
Condensed Financial Statements, Captions [Line Items]        
Net Cash Provided by (Used in) Operating Activities, Continuing Operations 5,395 17,183    
Cash Provided by (Used in) Operating Activities, Discontinued Operations 0 0    
Cash provided by (used in) operating activities 5,395 17,183    
Capital expenditures (14,341) (16,975)    
Proceeds from the sale of assets 60 6,151    
Purchase of short term investments and equity securities 0 0    
Sales and maturities of short-term investments 552 863    
Payments for (Proceeds from) Other Investing Activities 0 0    
Payments to Acquire Interest in Subsidiaries and Affiliates 37 (70)    
Net Cash Provided by (Used in) Investing Activities, Continuing Operations (13,692) (10,031)    
Cash Provided by (Used in) Investing Activities, Discontinued Operations 0 0    
CASH USED IN INVESTING ACTIVITIES (13,692) (10,031)    
Proceeds from Issuance of Unsecured Debt 0      
Repayments of Long-term Debt, Long-term Capital Lease Obligations, and Capital Securities (2,395) (1,874)    
Proceeds From Repayment Intercompany Borrowings 10,946 9,325    
Proceeds from (Payments for) Other Financing Activities 0 0    
Net Cash Provided by (Used in) Financing Activities, Continuing Operations (13,341) (11,199)    
Cash Provided by (Used in) Financing Activities, Discontinued Operations 0 0    
Net Cash Provided by (Used in) Financing Activities (13,341) (11,199)    
Effect of exchange rate changes on cash and cash equivalents 2 0    
Net Cash Provided by (Used in) Discontinued Operations 0 0    
CashAndCashEquivalentsPeriodIncreaseDecreaseExcludingNetCashProvidedByUsedInDiscontinuedOperationsAssetsHeldForSale (21,636) (4,047)    
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents 30,603 45,976 52,239 50,023
Non-Guarantor Subsidiaries        
Condensed Financial Statements, Captions [Line Items]        
Net Cash Provided by (Used in) Operating Activities, Continuing Operations 22,040 47,644    
Cash Provided by (Used in) Operating Activities, Discontinued Operations (2,690) 11,335    
Cash provided by (used in) operating activities 19,350 58,979    
Capital expenditures (27,921) (6,297)    
Proceeds from the sale of assets 0 (48)    
Purchase of short term investments and equity securities 0 0    
Sales and maturities of short-term investments 0 0    
Payments for (Proceeds from) Other Investing Activities (65) (60)    
Payments to Acquire Interest in Subsidiaries and Affiliates 169 67    
Net Cash Provided by (Used in) Investing Activities, Continuing Operations (27,817) (6,338)    
Cash Provided by (Used in) Investing Activities, Discontinued Operations (28,470) (388)    
CASH USED IN INVESTING ACTIVITIES (56,287) (6,726)    
Proceeds from Issuance of Unsecured Debt 0      
Repayments of Long-term Debt, Long-term Capital Lease Obligations, and Capital Securities (16,054) (1,332)    
Proceeds From Repayment Intercompany Borrowings (31,327) 8,612    
Proceeds from (Payments for) Other Financing Activities 0 0    
Net Cash Provided by (Used in) Financing Activities, Continuing Operations 15,273 (9,944)    
Cash Provided by (Used in) Financing Activities, Discontinued Operations (22) (20)    
Net Cash Provided by (Used in) Financing Activities 15,251 (9,964)    
Effect of exchange rate changes on cash and cash equivalents 555 555    
Net Cash Provided by (Used in) Discontinued Operations (32,930) 5,527    
CashAndCashEquivalentsPeriodIncreaseDecreaseExcludingNetCashProvidedByUsedInDiscontinuedOperationsAssetsHeldForSale 11,799 37,317    
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents 106,929 47,558 95,130 10,241
Eliminations        
Condensed Financial Statements, Captions [Line Items]        
Net Cash Provided by (Used in) Operating Activities, Continuing Operations (3,956) (16,076)    
Cash Provided by (Used in) Operating Activities, Discontinued Operations 0 0    
Cash provided by (used in) operating activities (3,956) (16,076)    
Capital expenditures 0 0    
Proceeds from the sale of assets 0 0    
Purchase of short term investments and equity securities 0 0    
Sales and maturities of short-term investments 0 0    
Payments for (Proceeds from) Other Investing Activities 0 0    
Payments to Acquire Interest in Subsidiaries and Affiliates 3,956 12,457    
Net Cash Provided by (Used in) Investing Activities, Continuing Operations 3,956 12,457    
Cash Provided by (Used in) Investing Activities, Discontinued Operations 0 0    
CASH USED IN INVESTING ACTIVITIES 3,956 12,457    
Proceeds from Issuance of Unsecured Debt 0      
Repayments of Long-term Debt, Long-term Capital Lease Obligations, and Capital Securities 0 0    
Proceeds From Repayment Intercompany Borrowings 0 3,619    
Proceeds from (Payments for) Other Financing Activities 0 0    
Net Cash Provided by (Used in) Financing Activities, Continuing Operations 0 3,619    
Cash Provided by (Used in) Financing Activities, Discontinued Operations 0 0    
Net Cash Provided by (Used in) Financing Activities 0 3,619    
Effect of exchange rate changes on cash and cash equivalents 0 0    
Net Cash Provided by (Used in) Discontinued Operations 0 0    
CashAndCashEquivalentsPeriodIncreaseDecreaseExcludingNetCashProvidedByUsedInDiscontinuedOperationsAssetsHeldForSale 0 0    
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents $ 0 $ 0 $ 0 $ 0