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Represents the number of maturity tranches used to fund the private placement.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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Average amount borrowed under the credit facility during the period.

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No definition available.

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Amount of long-term debt and capital lease obligation due after one year or beyond the normal operating cycle, if longer.

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Amount of long-term debt and capital leases due within one year or the normal operating cycle, if longer.

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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The cash inflow during the period from additional borrowings in aggregate debt. Includes proceeds from short-term and long-term debt.

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The cash inflow associated with the amount received from entity's raising of capital via private rather than public placement.

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Weighted average interest rate of short-term debt outstanding.

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DEBT (Details) $ in Thousands	1 Months Ended		12 Months Ended		24 Months Ended
DEBT (Details) $ in Thousands	Feb. 28, 2015 USD ($)	Dec. 31, 2014 USD ($) item	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2015 USD ($)
Debt
Proceeds from private placement		$ 475,000
Long-term obligations including current maturities		607,584	$ 814,413	$ 607,584	$ 814,413
Current maturities of long-term obligations		(18,692)	(51,889)	(18,692)	(51,889)
Long-term obligations		$ 588,892	762,524	588,892	762,524
Aggregate long-term maturities, excluding capital lease obligations
2016			51,368		51,368
2017			919		919
2018			75,183		75,183
2019			185		185
2020			84,186		84,186
Thereafter			600,944		$ 600,944
Unsecured lines of credit
Debt
Average borrowings			$ 42,700	$ 198,300
Average annual interest rate on short-term notes payable (as a percent)		1.50%	6.80%	1.50%	6.80%
Revolving credit facility
Debt
Amount outstanding under line of credit		$ 230,000	$ 0	$ 230,000	$ 0
Credit facility interest and fees			900	2,700
Notes payable
Debt
Proceeds from debt	$ 225,000	$ 250,000
Number of maturity tranches in funding of private placement \| item		2
Notes payable 0.61% - 27.26%, due in monthly and annual installments through 2025
Debt
Long-term obligations including current maturities		$ 5,160	3,785	5,160	$ 3,785
Interest rate on notes payable, low end of range (as a percent)					0.61%
Interest rate on notes payable, high end of range (as a percent)					16.00%
Senior unsecured notes 2.3%, due in 2015
Debt
Long-term obligations including current maturities		$ 16,000	$ 0	$ 16,000	$ 0
Interest rate on senior unsecured notes (as a percent)		2.30%	2.30%	2.30%	2.30%
Senior unsecured notes 6.0%, due in 2016
Debt
Long-term obligations including current maturities		$ 50,000	$ 50,000	$ 50,000	$ 50,000
Interest rate on senior unsecured notes (as a percent)		6.00%	6.00%	6.00%	6.00%
Senior unsecured notes 6.0%, due in 2018
Debt
Long-term obligations including current maturities		$ 75,000	$ 75,000	$ 75,000	$ 75,000
Interest rate on senior unsecured notes (as a percent)		6.00%	6.00%	6.00%	6.00%
Senior unsecured notes 3.8%, due in 2020
Debt
Long-term obligations including current maturities		$ 84,000	$ 84,000	$ 84,000	$ 84,000
Interest rate on senior unsecured notes (as a percent)		3.80%	3.80%	3.80%	3.80%
Senior unsecured notes 3.2%, due in 2022
Debt
Long-term obligations including current maturities		$ 75,000	$ 75,000	$ 75,000	$ 75,000
Interest rate on senior unsecured notes (as a percent)		3.20%	3.20%	3.20%	3.20%
Senior unsecured notes 3.5%, due in 2023
Debt
Term of debt		9 years
Long-term obligations including current maturities		$ 125,000	$ 125,000	$ 125,000	$ 125,000
Interest rate on senior unsecured notes (as a percent)		3.49%	3.49%	3.49%	3.49%
Senior unsecured notes 3.4%, due in 2024
Debt
Long-term obligations including current maturities		$ 50,000	$ 50,000	$ 50,000	$ 50,000
Interest rate on senior unsecured notes (as a percent)		3.40%	3.40%	3.40%	3.40%
Senior unsecured notes 3.5%, due in 2024
Debt
Term of debt	9 years
Long-term obligations including current maturities			$ 100,000		$ 100,000
Interest rate on senior unsecured notes (as a percent)			3.49%		3.49%
Senior unsecured notes 3.6%, due in 2025
Debt
Term of debt		11 years
Long-term obligations including current maturities		$ 125,000	$ 125,000	$ 125,000	$ 125,000
Interest rate on senior unsecured notes (as a percent)		3.61%	3.61%	3.61%	3.61%
Senior unsecured notes 3.6%, due in 2026
Debt
Term of debt	11 years
Long-term obligations including current maturities			$ 125,000		$ 125,000
Interest rate on senior unsecured notes (as a percent)			3.61%		3.61%
Capital lease obligations
Debt
Long-term obligations including current maturities		$ 2,424	$ 1,628	$ 2,424	$ 1,628