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Contingencies - Rollforward of Remediation Reserves (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Contingencies
Accrued liabilities start of period	$ 5,116	$ 3,847
Remediation expense	1,521	2,133
Remediation payments	(2,719)	(864)
Accrued liabilities end of period	$ 3,918	$ 5,116

Carrying value of the obligation (known or estimated) arising from requirements to perform activities to remediate one or more sites, payable in twelve months or in the next operating cycle if longer.

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