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Goodwill (Details Textual) (USD $) In Millions, except Share data, unless otherwise specified |  |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Mar. 31, 2013 | Mar. 31, 2012 | Mar. 31, 2013 Strata [Member] | Dec. 31, 2012 Strata [Member] | Dec. 24, 2012 Strata [Member]
Goodwill (Textual) [Abstract] |  |  |  |  |
Date of acquisition |  |  | Dec. 24, 2012 |  |
Voting equity interests acquired |  |  |  |  | 100.00%
Annual sales |  |  |  | $ 20 |
Purchase price |  |  |  |  | 53.1
Payable in cash |  |  | 5.0 |  |
Acquisition related contingent consideration |  |  | 4.4 |  |
Transfer of common stock |  |  | 60,368 |  |
Fair value of pre determined target at acquisition date |  |  | 2.0 |  |
Goodwill (Additional Textual) [Abstract] |  |  |  |  |
Historical accumulated amortization | $ 298.5 | $ 298.5 |  |  |

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