Intangible Assets and Goodwill (Tables)

12 Months Ended

Dec. 31, 2012

Intangible Assets [Abstract]

Schedule of Acquired Finite-Lived Intangible Assets by Major Class [Table Text Block]

		2012	2011
Software license fees	$	35,416	30,392
Customer relationships		3,036	4,435
Right-of-way		783	783
		39,235	35,610
Less accumulated amortization		22,675	19,775
Net other intangible assets	$	16,560	15,835

ScheduleOfFiniteLivedIntangibleAssetsTableTextBlock

Balance at December 31, 2010	$	17,717
Asset additions		4,157
Less amortization expense		6,039
Balance at December 31, 2011		15,835
Asset additions		5,952
Less amortization expense		5,227
Balance at December 31, 2012	$	16,560

Schedule Of Amortization Expense [Table Text Block]

		Years Ended December 31,
		2012	2011	2010
Amortization expense	$	5,227	6,039	6,360

Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]

Years Ending December 31,
2013	$	5,098
2014		4,242
2015		3,090
2016		1,473
2017		582