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Stock Based Compensation Stock Options Outstanding (Tables) | 12 Months Ended
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Dec. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block] | A summary of PSP activity for the years ended December 31, 2015, 2014 and 2013 is as follows:
| Weighted- Average Grant Date Fair Value |  | Granted Shares |  | Awarded Shares |  | Shares Not Yet Awarded
Outstanding at January 1, 2013 | $ | 8.72 |  |  | 3,691,022 |  |  | 2,394,505 |  |  | 1,296,517 |
Granted | $ | — |  |  | — |  |  | — |  |  | — |
Awarded | $ | 10.25 |  |  | — |  |  | 122,021 |  |  | (122,021 | )
Vested | $ | 4.01 |  |  | (119,364 | ) |  | (119,364 | ) |  | — |
Forfeited | $ | 8.73 |  |  | (1,200,371 | ) |  | (101,310 | ) |  | (1,099,061 | )
Outstanding at December 31, 2013 | $ | 8.62 |  |  | 2,371,287 |  |  | 2,295,852 |  |  | 75,435 |
Granted | $ | — |  |  | — |  |  | — |  |  | — |
Awarded | $ | — |  |  | — |  |  | — |  |  | — |
Vested | $ | 16.76 |  |  | (277,009 | ) |  | (277,009 | ) |  | — |
Forfeited | $ | 9.75 |  |  | (165,647 | ) |  | (115,630 | ) |  | (50,017 | )
Outstanding at December 31, 2014 | $ | 8.71 |  |  | 1,928,631 |  |  | 1,903,213 |  |  | 25,418 |
Granted | $ | — |  |  | — |  |  | — |  |  | — |
Awarded | $ | — |  |  | — |  |  | — |  |  | — |
Vested | $ | 5.55 |  |  | (208,889 | ) |  | (208,889 | ) |  | — |
Forfeited | $ | 9.78 |  |  | (117,528 | ) |  | (100,110 | ) |  | (17,418 | )
Outstanding at December 31, 2015 | $ | 9.03 |  |  | 1,602,214 |  |  | 1,594,214 |  |  | 8,000 |
A summary of stock option activity for the years ended December 31, 2015, 2014 and 2013 is as follows:
Stock Options |  | Shares Under Option |  | Weighted- Average Exercise Price |  | Weighted- Average Remaining Contractual Term (in years) |  | Aggregate Intrinsic Value (in thousands)
Outstanding at January 1, 2013 |  | 738,792 |  |  | $ | 18.39 |  |  | 4.9 |  | $ | 8,891 |
Granted |  | — |  |  | $ | — |  |  |  |  |  |
Exercised |  | (115,847 | ) |  | $ | 17.56 |  |  |  |  |  |
Forfeited |  | — |  |  | $ | — |  |  |  |  |  |
Expired |  | — |  |  | $ | — |  |  |  |  |  |
Outstanding at December 31, 2013 |  | 622,945 |  |  | $ | 18.55 |  |  | 4.1 |  | $ | 7,289 |
Granted |  | — |  |  | $ | — |  |  |  |  |  |
Exercised |  | (106,589 | ) |  | $ | 18.48 |  |  |  |  |  |
Forfeited |  | (46,000 | ) |  | $ | 18.48 |  |  |  |  |  |
Expired |  | — |  |  | $ | — |  |  |  |  |  |
Outstanding at December 31, 2014 |  | 470,356 |  |  | $ | 18.57 |  |  | 3.1 |  | $ | 5,087 |
Granted |  | — |  |  | $ | — |  |  |  |  |  |
Exercised |  | (151,767 | ) |  | $ | 18.48 |  |  |  |  |  |
Forfeited |  | (49,000 | ) |  | $ | 19.36 |  |  |  |  |  |
Expired |  | — |  |  | $ | — |  |  |  |  |  |
Outstanding at December 31, 2015 |  | 269,589 |  |  | $ | 18.48 |  |  | 2.2 |  | $ | 2,395 |
Ending vested and expected to vest at December 31, 2015 |  | 269,589 |  |  | $ | 18.48 |  |  | 2.2 |  | $ | 2,395 |
Exercisable at December 31, 2015 |  | 164,589 |  |  | $ | 18.48 |  |  | 2.2 |  | $ | 2,241 |
Exercisable at December 31, 2014 |  | 316,356 |  |  | $ | 18.48 |  |  | 3.2 |  | $ | 4,565 |
Exercisable at December 31, 2013 |  | 422,945 |  |  | $ | 18.48 |  |  | 4.2 |  | $ | 5,460 |
A summary of SIP activity for the years ended December 31, 2015, 2014 and 2013 is as follows:
| Weighted- Average Grant Date Fair Value |  | Granted Shares |  | Awarded Shares |  | Shares Not Yet Awarded
Outstanding at January 1, 2013 | $ | 22.91 |  |  | 3,157,311 |  |  | 37,408 |  |  | 3,119,903 |
Granted | $ | 31.95 |  |  | 3,719,974 |  |  | — |  |  | 3,719,974 |
Awarded | $ | 30.71 |  |  | — |  |  | 966,215 |  |  | (966,215 | )
Vested | $ | — |  |  | — |  |  | — |  |  | — |
Forfeited | $ | 23.88 |  |  | (271,184 | ) |  | (7,906 | ) |  | (263,278 | )
Outstanding at December 31, 2013 | $ | 27.96 |  |  | 6,606,101 |  |  | 995,717 |  |  | 5,610,384 |
Granted | $ | 31.02 |  |  | 422,572 |  |  | 113,088 |  |  | 309,484 |
Awarded | $ | — |  |  | — |  |  | — |  |  | — |
Vested | $ | — |  |  | — |  |  | — |  |  | — |
Forfeited | $ | 27.41 |  |  | (369,626 | ) |  | (47,915 | ) |  | (321,711 | )
Outstanding at December 31, 2014 | $ | 28.19 |  |  | 6,659,047 |  |  | 1,060,890 |  |  | 5,598,157 |
Granted | $ | 31.74 |  |  | 481,166 |  |  | 164,646 |  |  | 316,520 |
Awarded | $ | — |  |  | — |  |  | — |  |  | — |
Vested | $ | — |  |  | — |  |  | — |  |  | — |
Forfeited | $ | 26.32 |  |  | (863,241 | ) |  | (95,542 | ) |  | (767,699 | )
Outstanding at December 31, 2015 | $ | 28.74 |  |  | 6,276,972 |  |  | 1,129,994 |  |  | 5,146,978 |
Schedule of Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding [Table Text Block] | The following table summarizes information about stock options outstanding at December 31, 2015:
Options Outstanding |  | Options Exercisable
Exercise Price |  | Number Outstanding |  | Weighted Average Remaining Contractual Life (years) |  | Weighted Average Exercise Price |  | Number Exercisable |  | Weighted Average Exercise Price
$18.48 |  | 269,589 |  |  | 2.2 |  | $ | 18.48 |  |  | 164,589 |  |  | $ | 18.48 |
Totals |  | 269,589 |  |  | 2.2 |  | $ | 18.48 |  |  | 164,589 |  |  | $ | 18.48 |

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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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