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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

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- Definition The cash inflow from the issuance of long-term debt that is not secured by collateral. Excludes proceeds from tax exempt unsecured debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3255-108585 + Details
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- Definition Amount of cash inflow (outflow) from financing activities classified as other. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3095-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3098-108585 + Details
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- Definition The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3179-108585 + Details
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