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Loans Payable and Other Borrowings (Details Textual) | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2015 USD ($) | Jul. 31, 2015 USD ($) | Mar. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Jul. 31, 2012 USD ($)
Line of Credit Facility [Line Items] |  |  |  |  |
Maximum borrowings outstanding | $ 110,000,000 |  |  |  |
Letters of credit outstanding | 17,195,000 |  |  | $ 19,489,000 |
Line of credit facility, remaining borrowing capacity | $ 482,800,000 |  |  |  |
Notes Payable, Other Payables [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Interest rate, minimum (percentage) | 0.00% |  |  |  |
Interest rate, maximum (percentage) | 6.00% |  |  |  |
Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Description of variable rate basis | LIBOR |  |  |  |
Base rate (percentage) | 0.19% |  |  |  |
Basis spread on variable rate (percentage) | 1.75% |  |  |  |
Revolving Credit Facility [Member] | Prime Rate [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Description of variable rate basis | Prime |  |  |  |
Base rate (percentage) | 3.25% |  |  |  |
Basis spread on variable rate (percentage) | 0.75% |  |  |  |
Revolving Credit Facility [Member] | Line of Credit [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Maximum borrowing capacity | $ 500,000,000 | $ 600,000,000 | $ 500,000,000 |  | $ 125,000,000
Line of credit facility, accordion feature, increase limit |  | $ 100,000,000 |  |  |
Minimum tangible net worth | $ 670,300,000 |  |  |  |
Leverage ratio (as a percentage) | 0.6 |  |  |  |
Interest coverage ratio | 1.5 |  |  |  |

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- Definition As of any date, for the applicable period of the four quarters then ended, the ratio of (a) Consolidated EBITDA to (b) Consolidated Interest Incurred. + References No definition available. + Details
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- Definition The ratio of (a) Consolidated Debt plus Additional Available Liquidity minus, Unrestricted Cash, to the extent Unrestricted Cash exceeds the Required Liquidity, divided by (b) Consolidated Debt plus Consolidated Tangible Net Worth plus Additional Available Liquidity. + References No definition available. + Details
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- Definition Maximum contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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