Amount of debt issuance costs capitalized during the period.

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The amount drawn from the available line of credit facility.

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Amount of amortization expense attributable to debt issuance costs.

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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Face (par) amount of debt instrument at time of issuance.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Amount of the required periodic payments applied to principal.

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Amount, before accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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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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The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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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 next 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 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 outflow from a repayment of a borrowing having initial term of repayment of more than three months. Includes repayments of short-term and long-term debt.

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The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.

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DEBT - Summary (Details) - USD ($) $ in Thousands		12 Months Ended
DEBT - Summary (Details) - USD ($) $ in Thousands	Dec. 20, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Apr. 01, 2015	Mar. 31, 2015
Debt
Unamortized debt issuance costs		$ 14,631	$ 17,402
Amortization of debt issuance costs		$ 4,733	2,655	$ 1,176
Letters of credit
Debt
Maximum borrowing capacity	$ 10,000
Swingline loans
Debt
Maximum borrowing capacity	20,000
JPMorgan Chase Bank N.A. And Capital One National Association
Debt
Unamortized debt issuance costs			2,079
JPMorgan Chase Bank N.A. And Capital One National Association \| Credit facility
Debt
Debt issuance costs			21,507
Capitalized debt issuance costs			$ 744
JPMorgan Chase Bank N.A. And Capital One National Association \| Revolving line of credit
Debt
Amount of borrowing	250,000
Maximum borrowing capacity					$ 175,000	$ 120,000
Interest rate (as a percent)		5.19%	4.04%
Weighted average borrowings		$ 164,301	$ 28,238
Maximum borrowings		231,200	188,250
Amount of borrowings available under the credit agreement		$ 73,700	61,750
JPMorgan Chase Bank N.A. And Capital One National Association \| Revolving line of credit \| Minimum
Debt
Monthly unused commitment fee (as a percent)		0.30%
JPMorgan Chase Bank N.A. And Capital One National Association \| Revolving line of credit \| Maximum
Debt
Monthly unused commitment fee (as a percent)		0.40%
JPMorgan Chase Bank N.A. And Capital One National Association \| Revolving line of credit \| Other noncurrent assets
Debt
Unamortized debt issuance costs		$ 4,246	$ 5,316
JPMorgan Chase Bank N.A. And Capital One National Association \| Term Loan A and Term Loan B
Contractual debt obligations
2019		11,500
2020		11,500
2021		11,500
2022		124,000
2023		$ 4,000
JPMorgan Chase Bank N.A. And Capital One National Association \| Term Loan A
Debt
Amount of borrowing	150,000
Interest rate (as a percent)		4.78%	4.04%
Quarterly principal payments		$ 1,875
JPMorgan Chase Bank N.A. And Capital One National Association \| Term Loan B
Debt
Amount of borrowing	$ 400,000
Interest rate (as a percent)		7.03%	6.04%
Quarterly principal payments		$ 1,000
Voluntary prepayment of debt		$ 74,000
JPMorgan Chase Bank N.A. And Capital One National Association \| Term Loan B \| LIBOR
Debt
Interest rate margin (as a percent)		4.50%
JPMorgan Chase Bank N.A. And Capital One National Association \| Term Loan B \| Base Rate
Debt
Interest rate margin (as a percent)		3.50%
JPMorgan Chase Bank N.A. And Capital One National Association \| Revolving line of credit and Term loan A \| LIBOR
Debt
Interest rate margin (as a percent)	1.00%	2.25%
JPMorgan Chase Bank N.A. And Capital One National Association \| Revolving line of credit and Term loan A \| Base Rate
Debt
Interest rate margin (as a percent)	0.50%	1.25%
JPMorgan Chase Bank N.A. And Capital One National Association \| DDTL
Debt
Maximum borrowing capacity					25,000
Amortization of debt issuance costs			$ 636
Drawn amount			$ 25,000
JPMorgan Chase Bank N.A. And Capital One National Association \| Term Loan
Debt
Maximum borrowing capacity					$ 120,000