Restricted Cash (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Restricted Cash and Cash Equivalents Items [Line Items]
Cash	$ 1,938us-gaap_Cash	$ 2,294us-gaap_Cash	$ 2,218us-gaap_Cash
Restricted cash	185	242
Comerica Bank [Member] \| Colorado [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Letters of credit outstanding, amount	$ 185	$ 185

- Definition

The carrying amounts of cash and cash equivalent items which are restricted as to withdrawal or usage. Restrictions may include legally restricted deposits held as compensating balances against short-term borrowing arrangements, contracts entered into with others, or entity statements of intention with regard to particular deposits; however, time deposits and short-term certificates of deposit are not generally included in legally restricted deposits. Excludes compensating balance arrangements that are not agreements which legally restrict the use of cash amounts shown on the balance sheet. For a classified balance sheet represents the current portion only (the noncurrent portion has a separate concept); there is a separate and distinct element for unclassified presentations.

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