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Common Stock (Details Textual) - USD ($) |  | 12 Months Ended |
--- | --- | --- | ---
May. 06, 2015 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Mar. 31, 2015
Class of Stock [Line Items] |  |  |  |  |
Stock Issued During Period, Value, New Issues |  | $ 92,259,597 | $ 73,302,109 | $ 93,393,049 |
Proceeds From Issuance Of Common Stock |  | 92,259,603 | $ 73,302,116 | $ 93,393,056 |
ATM Program [Member] |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Gross Amount Remaining To Be Issued |  | $ 60,000,000 |  |  |
Common Stock Average Price |  | $ 30.31 |  |  |
Common Stock [Member] |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Registration Payment Arrangement, Maximum Potential Consideration |  |  |  |  | $ 500,000,000
Shares, Issued |  | 1,725,000 | 2,587,500 |  |
Stock Issued, Value, Stock Options Exercised, Net of Tax Benefit (Expense) |  | $ 52,950,000 | $ 71,511,000 |  |
Common Stock [Member] | ATM Program [Member] |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Stock Issued During Period, Value, New Issues |  | 1,318,812 |  |  |
Proceeds From Issuance Of Common Stock |  | $ 40,000,000 |  |  |
Value Of Equity Instruments To Be Issued | $ 100,000,000 |  |  |  |

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