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Summary of Significant Accounting Policies (Details 1) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2014 | Dec. 31, 2013
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Carrying Value |  |
Carrying value and estimated fair value of debt |  |
Credit Agreement (carrying value including current maturities) | $ 127,500 | $ 135,000
Convertible debt (par value) | 150,000 | 150,000
Fair Value |  |
Carrying value and estimated fair value of debt |  |
Credit Agreement (carrying value including current maturities) | 127,500 | 135,000
Convertible debt (par value) | $ 188,145 | $ 199,800

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- Definition Fair value portion of borrowing which can be exchanged for a specified number of another security at the option of the issuer or the holder, for example, but not limited to, the entity's common stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Convertible Security -URI http://asc.fasb.org/extlink&oid=6509036 + Details
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- Definition Fair value portion of contractual arrangement with a lender under which borrowings can be made up to a specific amount at any point in time. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Line-of-Credit Arrangement -URI http://asc.fasb.org/extlink&oid=6517033 + Details
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