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Bank and Other Notes Payable: (Details) (USD $) In Thousands, unless otherwise specified	0 Months Ended	1 Months Ended	3 Months Ended	12 Months Ended				0 Months Ended	3 Months Ended						0 Months Ended
	Mar. 15, 2012 Senior Notes	Mar. 31, 2007 Senior Notes	Mar. 31, 2013 Line of Credit	Dec. 31, 2012 Line of Credit	May 02, 2011 Line of Credit	May 02, 2011 Line of Credit Low end of range	May 02, 2011 Line of Credit High end of range	Dec. 08, 2011 Unsecured term loan	Mar. 31, 2013 Unsecured term loan	Dec. 31, 2012 Unsecured term loan	Dec. 08, 2011 Unsecured term loan Low end of range	Dec. 08, 2011 Unsecured term loan High end of range	Mar. 31, 2013 Greeley Note	Dec. 31, 2012 Greeley Note	Mar. 29, 2013 Prasada Note	Mar. 31, 2013 Prasada Note
Bank and other notes payable
Debt issued		$ 950,000						$ 125,000							$ 13,330
Interest rate on debt (as a percent)		3.25%													5.25%
Repayment of Senior Notes	439,318
Debt, carrying value													23,808	24,027
Effective interest rate (as a percent)													6.34%
Debt, fair value													24,222	24,685
Revolving line of credit					1,500,000
Reference rate for variable interest rate			LIBOR						LIBOR
Term of extension			1 year
Variable interest rate spread (as a percent)			2.25%			1.75%	3.00%		2.20%		1.95%	3.20%
Maximum expanded revolving line of credit			2,000,000
Interest rate (as a percent)									2.56%	2.57%
Line of credit, average interest rate (as a percent)			2.74%	2.76%
Outstanding borrowings under the line of credit			635,000	675,000
Fair value of outstanding line of credit			636,502	675,107
Fair value of debt									$ 122,847	$ 121,821						$ 13,330

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- Definition

The expanded maximum borrowing capacity to which the credit facility can be adjusted depending on certain conditions.

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The term of the extension option on the credit facility.

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

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Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date before deducting unamortized discount or premiums (if any). May include notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, which had initial maturities beyond one year or beyond the normal operating cycle, if longer.

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The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR.

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Increase of additional borrowings on existing and new debt instruments.

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The effective interest rate at the end of the reporting period.

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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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Interest rate stated in the contractual debt agreement.

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Amount borrowed under the credit facility as of the balance sheet date.

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Fair value of the amount outstanding under the credit facility.

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The effective interest rate during the reporting period.

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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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The cash outflow for a long-term borrowing where lender is placed in a lien position behind debt having a higher priority of repayment (senior) in case of liquidation of the entity's assets as it matures.

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