Investments (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost, Current	$ 5,844us-gaap_HeldToMaturitySecuritiesCurrent	$ 5,914us-gaap_HeldToMaturitySecuritiesCurrent
Municipal Bonds [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost, Current	5,844	5,914
Amortized Cost, Due from one through five years	13,116	14,398
Amortized Cost, Due from six through ten years	8,957	9,337
Amortized Cost, Due from eleven through twenty years	1,097	805
Amortized Cost, Total	29,014	30,454
Market Value, Current	5,919	6,006
Market Value, Due from one through five years	13,856	15,204
Market Value, Due from six through ten years	9,366	9,711
Market Value, Due from eleven through twenty years	1,069	762
Market Value, Total	$ 30,210	$ 31,683

Amount after other than temporary impairment (OTTI) accretion, of investments in debt securities classified as held-to-maturity, expected to be converted to cash, sold or exchanged within one year or the normal operating cycle.

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Fair value of held-to-maturity debt securities maturing in the sixth fiscal year through the tenth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Carrying amount of debt securities accounted for as held-to-maturity, net of adjustments including, but not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized, and fair value hedge accounting adjustments, maturing in the fifth through tenth fiscal year following the latest fiscal year.

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Fair value of held-to-maturity debt securities maturing in the second fiscal year through the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Carrying amount of debt securities accounted for as held-to-maturity, net of adjustments including, but not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized, and fair value hedge accounting adjustments, maturing in the next fiscal year through the fifth fiscal year following the latest fiscal year.

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Fair value of held-to-maturity debt securities maturing after the tenth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of investment in held-to-maturity debt securities with a single maturity date, after other than temporary impairment (OTTI) accretion.

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Fair value of investment in held-to-maturity debt securities with a single maturity date.

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Fair value of held-to-maturity debt securities maturing in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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