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Investments (Details-3) (ATC [Member], USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
ATC [Member] |  |  |
Equity method investment summarized income statement [Abstract] |  |  |
Operating revenues | $ 626,336 | $ 603,254 | $ 567,174
Operating expenses | (295,069) | (280,999) | (261,568)
Other income (expense) | 831 | (2,533) | (1,332)
Interest expense, net | (84,484) | (82,296) | (80,359)
Earnings before members' income taxes | 247,614 | 237,426 | 223,915
Equity method investment balance sheet assets [Abstract] |  |  |
Current assets | 80,715 | 63,134 | 58,671
Noncurrent assets | 3,509,517 | 3,274,704 | 3,053,742
Total assets | 3,590,232 | 3,337,838 | 3,112,413
Equity method investment balance sheet liabilities [Abstract] |  |  |
Current liabilities | 381,467 | 251,541 | 298,473
Long-term debt | 1,550,000 | 1,550,000 | 1,400,005
Other noncurrent liabilities | 126,167 | 95,829 | 82,647
Members' equity | 1,532,598 | 1,440,468 | 1,331,288
Total members' equity and liabilities | $ 3,590,232 | $ 3,337,838 | $ 3,112,413

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