Long-Term Debt (Tables)

12 Months Ended

Dec. 31, 2012

Long-Term Debt [Abstract]

Schedule of Long-term Debt Instruments [Table Text Block]

		2012	2011
2021 Notes (a)	$	325,000	325,000
2019 Notes (b)		425,000	425,000
Senior Credit Facility (c)		90,000	60,000
Rural Utility Service ("RUS") debt (d)		38,997	52,944
CoBank Mortgage ("CoBank") note payable (d)		797	1,344
Debt		879,794	864,288
Less unamortized discount paid on the 2019 Notes		2,743	3,016
Less current portion of long-term debt		1,928	3,241
Long-term debt, net	$	875,123	858,031

Senior Note Redemption [Table Text Block]

If redeemed during the twelve month period commencing June 1 of the year indicated:	Redemption Price
2016	103.375%
2017	102.250%
2018	101.125%
2019 and thereafter	100.000%

If redeemed during the twelve month period commencing November 15 of the year indicated:	Redemption Price
2014	104.313%
2015	102.875%
2016	101.438%
2017 and thereafter	100.000%

Interest Margin [Table Text Block]

Total Leverage Ratio (as defined)	Applicable Margin
>3.75	4.00%
>3.25 but <3.75	3.50%
>2.75 but <3.25	3.00%
<2.75	2.50%

Schedule of Maturities of Long-term Debt [Table Text Block]

Years ending December 31,
2013	$	1,928
2014		1,525
2015		91,387
2016		1,430
2017		1,475
2018 and thereafter		782,049
		879,794
Less unamortized discount paid on 2019 Notes		2,743
Less current portion of long-term debt		1,928
	$	875,123