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Stock Based Compensation Summary of Stock Based Compensation Plan Activity (Tables) | 12 Months Ended
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Dec. 31, 2017
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block] | A summary of stock option activity for the years ended December 31, 2017, 2016 and 2015 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, 2015 |  | 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 |
Granted |  | — |  |  | $ | — |  |  |  |  |  |
Exercised |  | (64,589 | ) |  | $ | 18.48 |  |  |  |  |  |
Forfeited |  | (30,000 | ) |  | $ | 18.48 |  |  |  |  |  |
Expired |  | — |  |  | $ | — |  |  |  |  |  |
Outstanding at December 31, 2016 |  | 175,000 |  |  | $ | 18.48 |  |  | 1.2 |  | $ | 4,616 |
Granted |  | — |  |  | $ | — |  |  |  |  |  |
Exercised |  | (175,000 | ) |  | $ | 18.48 |  |  |  |  |  |
Forfeited |  | — |  |  | $ | — |  |  |  |  |  |
Expired |  | — |  |  | $ | — |  |  |  |  |  |
Outstanding at December 31, 2017 |  | — |  |  | $ | — |  |  | N/A |  | $ | — |
Ending vested and expected to vest at December 31, 2017 |  | — |  |  | $ | — |  |  | N/A |  | $ | — |
Exercisable at December 31, 2017 |  | — |  |  | $ | — |  |  | N/A |  | $ | — |
Exercisable at December 31, 2016 |  | 175,000 |  |  | $ | 18.48 |  |  | 1.2 |  | $ | 4,616 |
Exercisable at December 31, 2015 |  | 164,589 |  |  | $ | 18.48 |  |  | 2.2 |  | $ | 2,241 |
A summary of SIP activity for the years ended December 31, 2017, 2016 and 2015 is as follows:
| Weighted- Average Grant Date Fair Value |  | Granted Shares |  | Awarded Shares |  | Shares Not Yet Awarded |
Outstanding at January 1, 2015 | $ | 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 |  |
Granted | $ | 35.52 |  |  | 972,099 |  |  | 182,653 |  |  | 789,446 |  | (1)
Awarded | $ | 24.93 |  |  | — |  |  | 1,431,319 |  |  | (1,431,319 | ) |
Vested | $ | 27.31 |  |  | (166,884 | ) |  | (166,884 | ) |  | — |  |
Forfeited | $ | 25.34 |  |  | (954,131 | ) |  | (175,788 | ) |  | (778,343 | ) |
Outstanding at December 31, 2016 | $ | 29.96 |  |  | 6,128,056 |  |  | 2,401,294 |  |  | 3,726,762 |  |
Granted | $ | 41.65 |  |  | 696,456 |  |  | 120,667 |  |  | 575,789 |  | (2)
Awarded | $ | 31.44 |  |  | — |  |  | 163,404 |  |  | (163,404 | ) |
Vested | $ | 25.22 |  |  | (242,457 | ) |  | (242,457 | ) |  | — |  |
Forfeited | $ | 29.77 |  |  | (171,060 | ) |  | (38,106 | ) |  | (132,954 | ) |
Outstanding at December 31, 2017 | $ | 31.16 |  |  | 6,410,995 |  |  | 2,404,802 |  |  | 4,006,193 |  |
A summary of PSP activity for the years ended December 31, 2017, 2016 and 2015 is as follows:
| Weighted- Average Grant Date Fair Value |  | Granted Shares |  | Awarded Shares |  | Shares Not Yet Awarded
Outstanding at January 1, 2015 | $ | 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 |
Granted | $ | — |  |  | — |  |  | — |  |  | — |
Awarded | $ | — |  |  | — |  |  | 4,000 |  |  | (4,000 | )
Vested | $ | 6.39 |  |  | (506,422 | ) |  | (506,422 | ) |  | — |
Forfeited | $ | 10.52 |  |  | (92,517 | ) |  | (88,517 | ) |  | (4,000 | )
Outstanding at December 31, 2016 | $ | 10.23 |  |  | 1,003,275 |  |  | 1,003,275 |  |  | — |
Granted | $ | — |  |  | — |  |  | — |  |  | — |
Awarded | $ | — |  |  | — |  |  | — |  |  | — |
Vested | $ | 9.61 |  |  | (138,801 | ) |  | (138,801 | ) |  | — |
Forfeited | $ | 10.47 |  |  | (17,236 | ) |  | (17,236 | ) |  | — |
Outstanding at December 31, 2017 | $ | 10.32 |  |  | 847,238 |  |  | 847,238 |  |  | — |

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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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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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