Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2017

Accounting Policies [Abstract]

Summary Of Activity Recorded Within The Allowance For Doubtful Accounts

The following table summarizes activity recorded within the allowance for doubtful accounts balances for the years ended December 31 (in thousands):

	2017			2016			2015
Beginning balance	$	5,272		$	4,868		$	4,280
Bad debt expense	1,253			2,519			1,404
Accounts written off and other adjustments	(91		)	(2,115		)	(816		)
Ending balance	$	6,434		$	5,272		$	4,868

Summary Of Interest Capitalized And Depreciation Expense

The table below sets forth the amount of interest capitalized and depreciation expense recognized during the years ended December 31 (in thousands):

	2017		2016		2015
Capitalized interest	$	137	$	138	$	166
Depreciation expense	$	12,929	$	14,477	$	17,869