Significant Accounting Policies Share-Based Compensation (Details)
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12 Months Ended |
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Dec. 31, 2014
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Stock Options [Member] | |
Share-based Compensation Arrangements by Share-based Payment Award [Line Items] | |
Vesting period (in years) | 7 years |
Prior to 2013 [Member] | Non-vested Common Stock [Member] | |
Share-based Compensation Arrangements by Share-based Payment Award [Line Items] | |
Vesting period (in years) | 5 years |
2013 Plan [Member] | Non-vested Common Stock [Member] | |
Share-based Compensation Arrangements by Share-based Payment Award [Line Items] | |
Vesting period (in years) | 3 years |
Share-based Compensation Arrangement by Share-based Payment Award, Award Required Holding Period | 2 years |