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Stock-Based Compensation Plans and Employee Benefits (Stock-based Compensation) (Details) $ / shares in Units, $ in Thousands		1 Months Ended					12 Months Ended
	Feb. 22, 2017 shares	Feb. 28, 2017 shares	Jun. 30, 2016 shares	Jan. 31, 2016 shares	Jan. 31, 2015 shares	May 31, 2014 shares	Dec. 31, 2017 USD ($) point Installment $ / shares shares	Dec. 31, 2016 USD ($) $ / shares shares	Dec. 31, 2015 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense | $							$ 18,812	$ 10,889	$ 12,013
Unrecognized compensation cost | $							$ 1,800
Weighted-average period to recognize the unrecognized compensation cost							1 year 8 months 12 days
Accrued expenses | $							$ 101,035	72,693
Forfeited (in shares)							37,513
Long-term Incentive Plan 2009
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized							8,000,000
Shares available for issuance							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 (in shares) | point							11.55
Preferred return (as a percent)							9.00%
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 (in shares) | 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 (in shares) | point							4.3
All Performance Incentive Plans
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Accrued expenses | $							$ 38,100	$ 22,400
Common stock subject to sales restriction | Employees
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issued							97,697
Non-vested weighted average grant date fair value per share (in dollars per share) | $ / shares							$ 12.04
Non-vested, aggregate intrinsic value | $							$ 1,200
Restricted shares awarded							62,704
Sale restriction period							18 months
Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Non-vested weighted average grant date fair value per share (in dollars per share) | $ / shares							$ 10.98	$ 11.33
Non-vested, aggregate intrinsic value | $							$ 3,183	$ 3,578
Non-vested, outstanding (in shares)							282,000	290,000
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, 2019 | Employees
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted units (in shares)	115,571
Number of cliff installments | Installment							1
Non-vested, outstanding (in shares)							111,642
Service Based Restricted Stock Units Vesting on each Anniversary Date
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Non-vested, outstanding (in shares)							60,000
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)							105,285
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
Vesting period							3 years

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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.

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Unrecognized cost of unvested share-based compensation awards.

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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.

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The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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