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Fair Value Measurements (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2015	Dec. 31, 2014	Jun. 30, 2014	Dec. 31, 2013
Fair Value | Level 1
Financial Instruments
Cash and cash equivalents	$ 631,549	$ 471,901
Fair Value | Level 2 | Retail
Financial Instruments
Long-term debt	1,435,862	1,414,105
Fair Value | Level 2 | Institutional and Other
Financial Instruments
Long-term debt	508,127	518,322
Book Value
Financial Instruments
Cash and cash equivalents	631,549	471,901
Book Value | Retail
Financial Instruments
Long-term debt	1,453,250	1,453,250
Book Value | Institutional and Other
Financial Instruments
Long-term debt	537,315	537,471
Cash and cash equivalents	$ 631,549	$ 471,901	$ 874,860	$ 830,014
Institutional and Other | Minimum
Financial Instruments
Fair value assumption, interest rate	0.00%	0.00%
Institutional and Other | Maximum
Financial Instruments
Fair value assumption, interest rate	7.44%	7.25%

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Interest rate assumption used in valuing an instrument.

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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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Carrying amount of long-term debt, net of unamortized discount or premium, excluding amounts to be repaid within one year or the normal operating cycle, if longer (current maturities). Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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