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Separate Financial Information of Guarantor Subsidiaries Statements of Cash Flows (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
OPERATING ACTIVITIES |  |  |  |
Net Cash Provided by Operating Activities |  | $ 79,970 | $ 54,174 | $ 57,878
INVESTING ACTIVITIES |  |  |  |
Purchases of Property, Plant and Equipment |  | (18,780) | (20,437) | (26,526)
Proceeds from Disposals of Property, Plant and Equipment |  | 112 | 2,511 | 615
Proceeds from Principal Payments Received on Long-Term Note Receivable |  | 1,416 | 667 | 0
Proceeds from Sale of Business | $ 4,000 | 4,000 | 0 | 285
Acquisitions of Businesses, Net of Cash Acquired |  | 0 | (354,073) | (12,933)
Issuance of Long-Term Note Receivable |  | 0 | (1,500) | (2,000)
Purchases of Intangible Asset |  | (2,775) | (2,500) | 0
Change in Investments in Subsidiaries |  | 0 | 0 | 0
Loan Proceeds Received by the Parent from Subsidiaries |  | 0 |  |
Loan Proceeds Received by Subsidiaries from the Parent |  | 0 |  |
Loan Borrowings (Payments) from Subsidiaries |  |  | 0 | 0
Net Cash Used in Investing Activities |  | (16,027) | (375,332) | (40,559)
FINANCING ACTIVITIES |  |  |  |
Proceeds from Short-Term Debt |  | 3,926 | 303,000 | 0
Repayments of Debt from Subsidiaries to Parent |  | 0 |  |
Repayments of Debt from the Parent to Subsidiaries |  | 0 |  |
Repayments of Short-term Debt |  | 0 | (303,000) | 0
Loan Borrowings (Payments) from Parent |  |  | 0 | 0
Change in Subsidiary Equity |  | 0 | 0 | 0
Proceeds from Issuance of Long-Term Debt |  | 11,000 | 440,000 | 15,000
Payments of Long-Term Debt |  | (38,255) | (96,248) | (3,460)
Purchases of Common Stock |  | 0 | 0 | (12,762)
Payments of Debt Issuance Costs |  | 0 | (16,482) | 0
Change in Capital Lease Obligations |  | 14 | 311 | 0
Proceeds from Issuances of Common Stock |  | 5,880 | 6,875 | 5,271
Payments to Noncontrolling Interests |  | 0 | (30) | 0
Excess Tax Benefit on Stock Plans |  | 0 | 0 | 686
Dividends Paid |  | (15,343) | (14,953) | (14,293)
Net Cash (Used in) Provided by Financing Activities |  | (32,778) | 319,473 | (9,558)
Effect of Exchange Rate on Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents |  | (4,082) | 2,186 | (1,150)
NET INCREASE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH |  | 27,083 | 501 | 6,611
Cash, Cash Equivalents and Restricted Cash at Beginning of Year | 59,051 | 59,051 | 58,550 | 51,939
CASH, CASH EQUIVALENTS, RESTRICTED CASH AND RESTRICTED CASH EQUIVALENTS AT END OF YEAR |  | 86,134 | 59,051 | 58,550
Parent Company |  |  |  |
OPERATING ACTIVITIES |  |  |  |
Net Cash Provided by Operating Activities |  | 68,082 | 26,992 | 44,147
INVESTING ACTIVITIES |  |  |  |
Purchases of Property, Plant and Equipment |  | (6,832) | (9,558) | (21,507)
Proceeds from Disposals of Property, Plant and Equipment |  | 21 | 23 | 377
Proceeds from Principal Payments Received on Long-Term Note Receivable |  | 0 | 0 |
Proceeds from Sale of Business |  | 0 |  | 0
Acquisitions of Businesses, Net of Cash Acquired |  |  | (304) | 0
Issuance of Long-Term Note Receivable |  |  | 0 | 0
Purchases of Intangible Asset |  | (2,500) | (2,500) |
Change in Investments in Subsidiaries |  | (15,622) | (199,028) | (19,594)
Loan Proceeds Received by the Parent from Subsidiaries |  | 1,218 |  |
Loan Proceeds Received by Subsidiaries from the Parent |  | 0 |  |
Loan Borrowings (Payments) from Subsidiaries |  |  | (159,780) | 8,690
Net Cash Used in Investing Activities |  | (23,715) | (371,147) | (32,034)
FINANCING ACTIVITIES |  |  |  |
Proceeds from Short-Term Debt |  | 0 | 303,000 |
Repayments of Debt from Subsidiaries to Parent |  | 0 |  |
Repayments of Debt from the Parent to Subsidiaries |  | (1,778) |  |
Repayments of Short-term Debt |  |  | (303,000) |
Loan Borrowings (Payments) from Parent |  |  | 4,983 | 0
Change in Subsidiary Equity |  | 0 | 0 |
Proceeds from Issuance of Long-Term Debt |  | 11,000 | 440,000 | 15,000
Payments of Long-Term Debt |  | (38,000) | (96,142) | (3,429)
Purchases of Common Stock |  |  |  | (12,762)
Payments of Debt Issuance Costs |  |  | (16,482) |
Change in Capital Lease Obligations |  | 0 | 0 |
Proceeds from Issuances of Common Stock |  | 5,880 | 6,875 | 5,271
Payments to Noncontrolling Interests |  |  | 0 |
Excess Tax Benefit on Stock Plans |  |  |  | 686
Dividends Paid |  | (15,343) | (14,953) | (14,293)
Net Cash (Used in) Provided by Financing Activities |  | (38,241) | 324,281 | (9,527)
Effect of Exchange Rate on Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents |  | 184 | (141) | 63
NET INCREASE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH |  | 6,310 | (20,015) | 2,649
Cash, Cash Equivalents and Restricted Cash at Beginning of Year | 18,469 | 18,469 | 38,484 | 35,835
CASH, CASH EQUIVALENTS, RESTRICTED CASH AND RESTRICTED CASH EQUIVALENTS AT END OF YEAR |  | 24,779 | 18,469 | 38,484
Guarantor Subsidiaries |  |  |  |
OPERATING ACTIVITIES |  |  |  |
Net Cash Provided by Operating Activities |  | 1,202 | 280 | 239
INVESTING ACTIVITIES |  |  |  |
Purchases of Property, Plant and Equipment |  | (99) | 0 | (13)
Proceeds from Disposals of Property, Plant and Equipment |  | 0 | 1 | 0
Proceeds from Principal Payments Received on Long-Term Note Receivable |  | 0 | 0 |
Proceeds from Sale of Business |  | 0 |  | 0
Acquisitions of Businesses, Net of Cash Acquired |  |  | 0 | (11,539)
Issuance of Long-Term Note Receivable |  |  | 0 | 0
Purchases of Intangible Asset |  | 0 | 0 |
Change in Investments in Subsidiaries |  | 0 | 0 | 0
Loan Proceeds Received by the Parent from Subsidiaries |  | 0 |  |
Loan Proceeds Received by Subsidiaries from the Parent |  | 0 |  |
Loan Borrowings (Payments) from Subsidiaries |  |  | 0 | 0
Net Cash Used in Investing Activities |  | (99) | 1 | (11,552)
FINANCING ACTIVITIES |  |  |  |
Proceeds from Short-Term Debt |  | 0 | 0 |
Repayments of Debt from Subsidiaries to Parent |  | 0 |  |
Repayments of Debt from the Parent to Subsidiaries |  | 0 |  |
Repayments of Short-term Debt |  |  | 0 |
Loan Borrowings (Payments) from Parent |  |  | 0 | 7,969
Change in Subsidiary Equity |  | 0 | 0 | 3,570
Proceeds from Issuance of Long-Term Debt |  | 0 | 0 | 0
Payments of Long-Term Debt |  | 0 | 0 | 0
Purchases of Common Stock |  |  |  | 0
Payments of Debt Issuance Costs |  |  | 0 |
Change in Capital Lease Obligations |  | 0 | 0 |
Proceeds from Issuances of Common Stock |  | 0 | 0 | 0
Payments to Noncontrolling Interests |  |  | 0 |
Excess Tax Benefit on Stock Plans |  |  |  | 0
Dividends Paid |  | 0 | 0 | 0
Net Cash (Used in) Provided by Financing Activities |  | 0 | 0 | 11,539
Effect of Exchange Rate on Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents |  | 0 | 0 | 0
NET INCREASE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH |  | 1,103 | 281 | 226
Cash, Cash Equivalents and Restricted Cash at Beginning of Year | 507 | 507 | 226 | 0
CASH, CASH EQUIVALENTS, RESTRICTED CASH AND RESTRICTED CASH EQUIVALENTS AT END OF YEAR |  | 1,610 | 507 | 226
Non-Guarantor Subsidiaries |  |  |  |
OPERATING ACTIVITIES |  |  |  |
Net Cash Provided by Operating Activities |  | 10,888 | 27,711 | 14,090
INVESTING ACTIVITIES |  |  |  |
Purchases of Property, Plant and Equipment |  | (11,849) | (10,879) | (5,006)
Proceeds from Disposals of Property, Plant and Equipment |  | 91 | 2,487 | 238
Proceeds from Principal Payments Received on Long-Term Note Receivable |  | 1,416 | 667 |
Proceeds from Sale of Business |  | 4,000 |  | 285
Acquisitions of Businesses, Net of Cash Acquired |  |  | (353,769) | (1,394)
Issuance of Long-Term Note Receivable |  |  | (1,500) | (2,000)
Purchases of Intangible Asset |  | (275) | 0 |
Change in Investments in Subsidiaries |  | 0 | 0 | 0
Loan Proceeds Received by the Parent from Subsidiaries |  | 0 |  |
Loan Proceeds Received by Subsidiaries from the Parent |  | 1,778 |  |
Loan Borrowings (Payments) from Subsidiaries |  |  | (4,983) | 0
Net Cash Used in Investing Activities |  | (4,839) | (367,977) | (7,877)
FINANCING ACTIVITIES |  |  |  |
Proceeds from Short-Term Debt |  | 3,926 | 0 |
Repayments of Debt from Subsidiaries to Parent |  | (1,218) |  |
Repayments of Debt from the Parent to Subsidiaries |  | 0 |  |
Repayments of Short-term Debt |  |  | 0 |
Loan Borrowings (Payments) from Parent |  |  | 159,780 | (16,659)
Change in Subsidiary Equity |  | 15,622 | 199,028 | 16,024
Proceeds from Issuance of Long-Term Debt |  | 0 | 0 | 0
Payments of Long-Term Debt |  | (255) | (106) | (31)
Purchases of Common Stock |  |  |  | 0
Payments of Debt Issuance Costs |  |  | 0 |
Change in Capital Lease Obligations |  | 14 | 311 |
Proceeds from Issuances of Common Stock |  | 0 | 0 | 0
Payments to Noncontrolling Interests |  |  | (30) |
Excess Tax Benefit on Stock Plans |  |  |  | 0
Dividends Paid |  | (202) | (809) | (598)
Net Cash (Used in) Provided by Financing Activities |  | 17,887 | 358,174 | (1,264)
Effect of Exchange Rate on Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents |  | (4,266) | 2,327 | (1,213)
NET INCREASE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH |  | 19,670 | 20,235 | 3,736
Cash, Cash Equivalents and Restricted Cash at Beginning of Year | 40,075 | 40,075 | 19,840 | 16,104
CASH, CASH EQUIVALENTS, RESTRICTED CASH AND RESTRICTED CASH EQUIVALENTS AT END OF YEAR |  | 59,745 | 40,075 | 19,840
Eliminations |  |  |  |
OPERATING ACTIVITIES |  |  |  |
Net Cash Provided by Operating Activities |  | (202) | (809) | (598)
INVESTING ACTIVITIES |  |  |  |
Purchases of Property, Plant and Equipment |  | 0 | 0 | 0
Proceeds from Disposals of Property, Plant and Equipment |  | 0 | 0 | 0
Proceeds from Principal Payments Received on Long-Term Note Receivable |  | 0 | 0 |
Proceeds from Sale of Business |  | 0 |  | 0
Acquisitions of Businesses, Net of Cash Acquired |  |  | 0 | 0
Issuance of Long-Term Note Receivable |  |  | 0 | 0
Purchases of Intangible Asset |  | 0 | 0 |
Change in Investments in Subsidiaries |  | 15,622 | 199,028 | 19,594
Loan Proceeds Received by the Parent from Subsidiaries |  | (1,218) |  |
Loan Proceeds Received by Subsidiaries from the Parent |  | (1,778) |  |
Loan Borrowings (Payments) from Subsidiaries |  |  | 164,763 | (8,690)
Net Cash Used in Investing Activities |  | 12,626 | 363,791 | 10,904
FINANCING ACTIVITIES |  |  |  |
Proceeds from Short-Term Debt |  | 0 | 0 |
Repayments of Debt from Subsidiaries to Parent |  | 1,218 |  |
Repayments of Debt from the Parent to Subsidiaries |  | 1,778 |  |
Repayments of Short-term Debt |  |  | 0 |
Loan Borrowings (Payments) from Parent |  |  | (164,763) | 8,690
Change in Subsidiary Equity |  | (15,622) | (199,028) | (19,594)
Proceeds from Issuance of Long-Term Debt |  | 0 | 0 | 0
Payments of Long-Term Debt |  | 0 | 0 | 0
Purchases of Common Stock |  |  |  | 0
Payments of Debt Issuance Costs |  |  | 0 |
Change in Capital Lease Obligations |  | 0 | 0 |
Proceeds from Issuances of Common Stock |  | 0 | 0 | 0
Payments to Noncontrolling Interests |  |  | 0 |
Excess Tax Benefit on Stock Plans |  |  |  | 0
Dividends Paid |  | 202 | 809 | 598
Net Cash (Used in) Provided by Financing Activities |  | (12,424) | (362,982) | (10,306)
Effect of Exchange Rate on Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents |  | 0 | 0 | 0
NET INCREASE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH |  | 0 | 0 | 0
Cash, Cash Equivalents and Restricted Cash at Beginning of Year | $ 0 | 0 | 0 | 0
CASH, CASH EQUIVALENTS, RESTRICTED CASH AND RESTRICTED CASH EQUIVALENTS AT END OF YEAR |  | $ 0 | $ 0 | $ 0

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- Definition The cash outflow to acquire asset without physical form usually arising from contractual or other legal rights, excluding goodwill. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3213-108585 + Details
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- Definition The cash outflow to acquire an agreement for an unconditional promise by the maker to pay the entity (holder) a definite sum of money at a future date. Such amount may include accrued interest receivable in accordance with the terms of the note. The note also may contain provisions including a discount or premium, payable on demand, secured, or unsecured, interest bearing or noninterest bearing, among myriad other features and characteristics. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3213-108585 + Details
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- Definition The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3213-108585 + Details
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- Definition Amount of cash outflow to a noncontrolling interest. Includes, but not limited to, reduction of noncontrolling interest ownership. Excludes dividends paid to the noncontrolling interest. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3291-108585 + Details
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- Definition The cash inflow associated with principal collections from a borrowing supported by a written promise to pay an obligation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3179-108585 + Details
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- Definition The cash inflow associated with the amount received from the sale of a portion of the company's business, for example a segment, division, branch or other business, during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3179-108585 + Details
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- Definition The cash inflow from the additional capital contribution to the entity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3255-108585 + Details
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- Definition The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3255-108585 + Details
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- Definition The cash inflow from proceeds received from lessor related to a long-term capital lease obligation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3255-108585 + 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3179-108585 + Details
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- Definition The cash inflow from a borrowing having initial term of repayment within one year or the normal operating cycle, if longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3255-108585 + Details
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- Definition The cash outflow associated with security instruments that either represent a creditor or an ownership relationship with the holder of the investment security with a maturity of beyond one year or normal operating cycle, if longer. Includes repayments of (a) debt, (b) capital lease obligations, (c) mandatory redeemable capital securities, and (d) any combination of (a), (b), or (c). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3291-108585 + Details
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- Definition The cash outflow for a borrowing having initial term of repayment within one year or the normal operating cycle, if longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3291-108585 + Details
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