Accounts Receivable (Tables)

3 Months Ended

Mar. 31, 2014

Receivables [Abstract]

Accounts Receivable

	March 31, 2014			December 31, 2013
	(in thousands)
Accounts receivable	$	45,767		$	39,256
Less:  Allowance for doubtful accounts	(63		)	(193		)
Total, net	$	45,704		$	39,063

Allowance for Doubtful Accounts

	Three months ended
	March 31, 2014			March 31, 2013
Allowance for doubtful accounts:	(in thousands)
Balance, beginning of period	$	193		$	52
Provisions for losses on accounts receivables	(130		)	269
Accounts receivable written off, net of recoveries	—			—
Balance, end of period	$	63		$	321