Summary of Significant Accounting Policies Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2012

Summary of Significant Accounting Policies [Abstract]

Allowance for Doubtful Accounts Receivable

Additions, deductions and balances for allowance for doubtful accounts for 2012, 2011 and 2010 are as follows (in thousands):

	2012		2011		2010
Balance at beginning of year	$	3,015	$	2,885	$	1,191
Additions:
Charged to costs and expense	3,087		6,209		4,756
Recovery of previous write-offs	2,041		2,034		852
Uncollectible receivables written off	5,237		8,113		3,914
Balance at end of year	$	2,906	$	3,015	$	2,885