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Shareholders' Equity and Common Stock Equivalents (Details 1) - $ / shares | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Summary of changes in outstanding options |  |  |
Weighted Average Option Price per Share, Beginning Balance | $ 24.00 |  |
Weighted Average Option Price per Share, Options Granted | 31.13 |  |
Weighted Average Option Price per Share, Options Vested | 22.73 |  |
Weighted Average Option Price per Share, Options Exercised | 17.02 |  |
Weighted Average Option Price per Share, Options Forfeited | 27.53 |  |
Weighted Average Option Price per Share, Options Expired | 0 |  |
Weighted Average Option Price per Share, Ending Balance | $ 27.67 | $ 24.00 |
Options Outstanding, Beginning Balance | 669,693 | 634,437 |
Options Outstanding, Granted | 307,176 | 142,908 | 175,632
Options Outstanding, Vested | 0 |  |
Options Outstanding, Exercised | (146,278) |  |
Options Outstanding, Forfeited | (83,559) |  |
Options Outstanding, Expired | 0 |  |
Options Outstanding, Ending Balance | 747,032 | 669,693 | 634,437
Options Vested and Exercisable, Beginning Balance | 281,632 |  |
Options Vested and Exercisable, Granted | 0 |  |
Options Vested and Exercisable, Vested | 137,763 |  |
Options Vested and Exercisable, Exercisable | (146,278) |  |
Options Vested and Exercisable, Forfeited | 0 |  |
Options Vested and Exercisable, Expired | 0 |  |
Options Vested and Exercisable, Ending Balance | 273,117 | 281,632 |
Minimum [Member] |  |  |
Summary of changes in outstanding options |  |  |
Weighted Average Option Price per Share, Ending Balance | $ 13.83 |  |
Range of Option Prices per Share, Beginning Balance | 6.91 |  |
Range of Option Prices per Share, Granted | 31.01 |  |
Range of Option Prices per Share, Vested | 13.83 |  |
Range of Option Prices per Share, Exercised | 6.91 |  |
Range of Option Prices per Share, Forfeited | 17.32 |  |
Range of Option Prices per Share, Expired | 0 |  |
Range of Option Prices per Share, Ending Balance | 13.83 | $ 6.91 |
Maximum [Member] |  |  |
Summary of changes in outstanding options |  |  |
Weighted Average Option Price per Share, Ending Balance | 36.04 |  |
Range of Option Prices per Share, Beginning Balance | 33.41 |  |
Range of Option Prices per Share, Granted | 36.04 |  |
Range of Option Prices per Share, Vested | 36.04 |  |
Range of Option Prices per Share, Exercised | 33.41 |  |
Range of Option Prices per Share, Forfeited | 32.35 |  |
Range of Option Prices per Share, Expired | 0 |  |
Range of Option Prices per Share, Ending Balance | $ 36.04 | $ 33.41 |

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