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Related Party Transactions (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013 Director	Dec. 31, 2014	Dec. 31, 2012
Related Party Transaction [Line Items]
Cash and cash equivalents	$ 7,183	$ 5,192	$ 8,625
Amount invested in United States Treasury money market funds	$ 5,589us-gaap_MoneyMarketFundsAtCarryingValue	$ 4,089us-gaap_MoneyMarketFundsAtCarryingValue
Number of common directors	1lgl_NumberOfCommonDirectors
Percentage of stockholders controlling a related party (in hundredths)	10.00%	10.00%

Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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