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Stock-Based Compensation Plans and Employee Benefits (Stock-based Compensation) (Details) $ in Thousands |  |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Feb. 22, 2017 Installment shares | Jun. 15, 2016 shares | Jan. 30, 2015 Installment shares | Feb. 28, 2017 shares | Jun. 30, 2016 shares | Jan. 31, 2016 shares | Jan. 31, 2015 shares | May 31, 2014 shares | Sep. 30, 2017 USD ($) shares | Sep. 30, 2016 USD ($) | Sep. 30, 2017 USD ($) point shares | Sep. 30, 2016 USD ($) | Dec. 31, 2016 USD ($) | Jan. 29, 2016 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross contributions made by the Company | $ |  |  |  |  |  |  |  |  | $ 200 | $ 100 | $ 1,000 | $ 900 |  |
Stock-based compensation expense | $ |  |  |  |  |  |  |  |  | 2,934 | $ 1,434 | 12,730 | $ 7,644 |  |
Unrecognized compensation cost | $ |  |  |  |  |  |  |  |  | 2,100 |  | $ 2,100 |  |  |
Weighted-average period to recognize the unrecognized compensation cost |  |  |  |  |  |  |  |  |  |  | 1 year 6 months 13 days |  |  |
Accrued expenses | $ |  |  |  |  |  |  |  |  | $ 93,031 |  | $ 93,031 |  | $ 72,693 |
Long-term Incentive Plan 2009 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares available for issuance |  |  |  |  |  |  |  |  | 3,300,000 |  | 3,300,000 |  |  |
2013-2014 Performance Incentive Plan |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of points issued (in shares) |  |  |  | 5 |  | 10 | 10 | 73 |  |  |  |  |  |
Number of points forfeited | point |  |  |  |  |  |  |  |  |  |  | 11.5 |  |  |
2015-2016 Performance Plan |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of points issued (in shares) |  |  |  | 18 | 2.5 | 40 | 34 |  |  |  |  |  |  |
Number of points forfeited | point |  |  |  |  |  |  |  |  |  |  | 10.0 |  |  |
2017-2018 Performance Incentive Plan |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of points issued (in shares) |  |  |  | 44 |  |  |  |  |  |  |  |  |  |
Number of points forfeited | point |  |  |  |  |  |  |  |  |  |  | 4.3 |  |  |
All Performance Incentive Plans |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accrued expenses | $ |  |  |  |  |  |  |  |  | $ 33,100 |  | $ 33,100 |  | $ 22,400 |
Common Stock Subject to Sales Restriction | Employees |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vested, number of shares |  |  |  |  |  |  |  |  |  |  | 97,967 |  |  |
Restricted shares awarded |  |  |  |  |  |  |  |  |  |  | 62,704 |  |  |
Sale restriction period |  |  |  |  |  |  |  |  |  |  | 18 months |  |  |
Service Based Restricted Stock Units Vesting on December 31, 2019 | Employees |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Granted units (in share) | 115,571 |  |  |  |  |  |  |  |  |  |  |  |  |
Number of vesting installments | Installment | 1 |  |  |  |  |  |  |  |  |  |  |  |  |
Non-vested, outstanding (in shares) |  |  |  |  |  |  |  |  | 111,642 |  | 111,642 |  |  |
Service Based Restricted Stock Units Vesting 20% on each Anniversary Date |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-vested, outstanding (in shares) |  | 60,000 |  |  |  |  |  |  |  |  |  |  |  |
Vesting term |  | 4 years |  |  |  |  |  |  |  |  |  |  |  |
Service Based Restricted Stock Units Vesting on December 31, 2018 | Employees |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-vested, outstanding (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  | 104,026
Performance Based Restricted Stock Units Vesting on December 31, 2017 | Employees |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-vested, outstanding (in shares) |  |  | 37,514 |  |  |  |  |  |  |  |  |  |  |
Risk-free interest rate (as a percent) |  |  | 0.75% |  |  |  |  |  |  |  |  |  |  |
Expected stock price volatility (as a percent) |  |  | 28.14% |  |  |  |  |  |  |  |  |  |  |
Performance Based Restricted Stock Units Vesting on December 31, 2017 | Employees | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting percentage |  |  | 0.00% |  |  |  |  |  |  |  |  |  |  |
Performance Based Restricted Stock Units Vesting on December 31, 2017 | Employees | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting percentage |  |  | 200.00% |  |  |  |  |  |  |  |  |  |  |
Service Based Restricted Stock Units Vesting on December 31, 2017 | Employees |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of vesting installments | Installment |  |  | 1 |  |  |  |  |  |  |  |  |  |  |
Non-vested, outstanding (in shares) |  |  | 54,201 |  |  |  |  |  |  |  |  |  |  |
Service Based Restricted Stock Units with specified vesting dates | Employees |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-vested, outstanding (in shares) |  |  |  |  |  |  |  |  | 4,751 |  | 4,751 |  |  |
Vesting term |  |  |  |  |  |  |  |  |  |  | 3 years |  |  |

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Amount of cost for defined contribution plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942 + Details
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- Definition Unrecognized cost of unvested share-based compensation awards. + 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 (i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 (i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The number of restricted shares issued as compensation, net of shares for the payment of withholding taxes. This element is to be used only if shares are used in lieu of cash to satisfy all or a portion of withholding taxes. + References No definition available. + Details
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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 (a)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + 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)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + 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 (f)(2)(ii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The risk-free interest rate assumption that is used in valuing an option on its own shares. + 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 (f)(2)(iv) -URI http://asc.fasb.org/extlink&oid=96867065&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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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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