Condensed Cash Flows Statements (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Operating activities:
Net income	$ 12,234	$ 12,780
Adjustments to reconcile net income to net cash provided by operating activities-
Depreciation and amortization	14,022	13,773
Deferred income tax	5,138	6,184
Employee benefits	1,548	1,914
AFUDC - equity	(183)	(229)
Other adjustments, net	618	1,185
Change in operating assets and liabilities -
Accounts receivable and other current assets	(869)	5,895
Accounts payable and other current liabilities	(5,260)	(8,978)
Contributions to defined benefit pension plan	0	(6,835)
Other operating activities, net	1,371	(3,754)
Net cash provided by (used in) operating activities	28,619	21,935
Investing activities:
Property, plant and equipment additions	(32,100)	(18,882)
Change in money pool notes receivable, net	2,186	3,278
Other investing activities	(27)	277
Net cash provided by (used in) investing activities	(29,941)	(15,327)
Financing activities:
Long-term debt - repayments	0	(6,487)
Net cash provided by (used in) financing activities	0	(6,487)
Net change in cash and cash equivalents	(1,322)	121
Cash and Cash Equivalents:
Cash and cash equivalents, beginning of period	3,805	2,812
Cash and cash equivalents, end of period	$ 2,483	$ 2,933