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Loans Payable and Other Borrowings Details Textual (Details) | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Jun. 30, 2015 USD ($) | Jun. 30, 2015 USD ($) | Jul. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Jul. 31, 2012 USD ($)
Line of Credit Facility [Line Items] |  |  |  |  |
Proceeds from Long-term Lines of Credit | $ 110,000,000 |  |  |  |
Letters of credit outstanding | 17,591,000 | $ 17,591,000 |  | $ 19,489,000 |
Line of Credit Facility, Remaining Borrowing Capacity | $ 482,400,000 | $ 482,400,000 |  |  |
Notes Payable, Other Payables [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Minimum |  | 0.00% |  |  |
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Maximum |  | 6.00% |  |  |
Letter of Credit [Member] | Line of Credit [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  | 200,000,000 |
Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Debt Instrument, Description of Variable Rate Basis |  | LIBOR |  |  |
Debt Instrument, Base Rate | 0.19% | 0.19% |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 1.75% |  |  |
Revolving Credit Facility [Member] | Prime Rate [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Debt Instrument, Description of Variable Rate Basis |  | Prime |  |  |
Debt Instrument, Base Rate | 3.25% | 3.25% |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 0.75% |  |  |
Revolving Credit Facility [Member] | Line of Credit [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | $ 500,000,000 | $ 500,000,000 |  | $ 400,000,000 | $ 125,000,000
Minimum Tangible Net Worth | $ 670,300,000 | $ 670,300,000 |  |  |
Leverage ratio (as a percentage) | 0.6 | 0.6 |  |  |
Interest Coverage Ratio |  | 1.5 |  |  |
Subsequent Event [Member] | Revolving Credit Facility [Member] | Line of Credit [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  | $ 600,000,000 |  |
Line of Credit Facility, Accordion Feature, Increase Limit |  |  | $ 100,000,000 |  |

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