Schedule II - Valuation and Qualifying Accounts (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Allowance for Doubtful Accounts [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at the Beginning of the Year ($)	$ 134	$ 157	$ 450
Charged to Expense ($)	61	22	193
Acquisitions/ Transfers and Other ($)	0	0	2
Write-offs Net of Recoveries ($)	(52)	(45)	(488)
Balance at the End of the Year ($)	143	134	157
Allowance for Excess and Obsolete Inventories [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at the Beginning of the Year ($)	3,570	1,941	3,276
Charged to Expense ($)	892	2,023	963
Acquisitions/ Transfers and Other ($)	(24)	12	8
Write-offs Net of Recoveries ($)	(419)	(406)	(2,306)
Balance at the End of the Year ($)	$ 4,019	$ 3,570	$ 1,941