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Amount of investment in debt and equity securities categorized neither as trading securities nor held-to-maturity securities and intended be sold or mature one year or operating cycle, if longer.

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Amount of long-term debt before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or the normal operating cycle, if longer.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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Fair value of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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-Paragraph 2
-Subparagraph (c)
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The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

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The carrying amounts of cash and cash equivalent items which are restricted as to withdrawal or usage. Restrictions may include legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or entity statements of intention with regard to particular deposits; however, time deposits and short-term certificates of deposit are not generally included in legally restricted deposits. Excludes compensating balance arrangements that are not agreements which legally restrict the use of cash amounts shown on the balance sheet. This element is for unclassified presentations; for classified presentations there is a separate and distinct element.

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Cash and equivalents whose use in whole or in part is restricted for the long-term, generally by contractual agreements or regulatory requirements.

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FAIR VALUE MEASUREMENTS AND FINANCIAL INSTRUMENTS (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Assets, Fair Value Disclosure [Abstract]
Cash and cash equivalents	$ 149,294	$ 179,327	$ 161,361	$ 130,324
Restricted cash	4,127	4,801
Available for sale securities	45,754	0
Liabilities, Fair Value Disclosure [Abstract]
Acquisition contingent consideration	376	3,932
Long-term debt	479,653	536,598
Fair Value, Level 1 \| Fair Value, Measurements, Recurring
Assets, Fair Value Disclosure [Abstract]
Cash and cash equivalents	149,294	179,327
Restricted cash, fair value	4,127	4,801
Available for sale securities	45,754	0
Liabilities, Fair Value Disclosure [Abstract]
Acquisition contingent consideration	0	0
Long-term debt, fair value	0	0
Fair Value, Level 2 \| Fair Value, Measurements, Recurring
Assets, Fair Value Disclosure [Abstract]
Cash and cash equivalents	0	0
Restricted cash, fair value	0	0
Available for sale securities	0	0
Liabilities, Fair Value Disclosure [Abstract]
Acquisition contingent consideration	0	0
Long-term debt, fair value	474,856	469,523
Fair Value, Level 3 \| Fair Value, Measurements, Recurring
Assets, Fair Value Disclosure [Abstract]
Cash and cash equivalents	0	0
Restricted cash, fair value	0	0
Available for sale securities	0	0
Liabilities, Fair Value Disclosure [Abstract]
Acquisition contingent consideration	376	3,932
Long-term debt, fair value	$ 0	$ 0