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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
	Jun. 15, 2016 shares	Jan. 29, 2016 shares	Jun. 30, 2016 shares	Jan. 31, 2016 shares	Jan. 31, 2015 shares	May 31, 2014 shares	Sep. 30, 2016 USD ($) shares	Sep. 30, 2015 USD ($)	Sep. 30, 2016 USD ($) Installment shares	Sep. 30, 2015 USD ($)	Dec. 31, 2015 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense | $							$ 1,434	$ 2,881	$ 7,644	$ 10,066
Unrecognized compensation cost | $							2,400		$ 2,400
Weighted-average period to recognize the unrecognized compensation cost									1 year 9 months 18 days
Accrued expenses | $							$ 69,711		$ 69,711		$ 68,937
Employees
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted units	20,000
Shares issued (in shares)	12,030
Long-term Incentive Plan 2009
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for issuance							3,600,000		3,600,000
2013-2014 Performance Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of points issued (in shares)				10	10	73
2015-2016 Performance Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of points issued (in shares)			2.5	40	34
All Performance Incentive Plans
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Accrued expenses | $							$ 20,300		$ 20,300		$ 16,600
Common Stock Subject to Sales Restriction | Employees
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vested, number of shares									92,057
Restricted shares awarded									58,667
Sale restriction period									18 months
Service Based Restricted Stock Units Vesting 20% on each Anniversary Date
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting term									4 years
Service Based Restricted Stock Units Vesting 20% on each Anniversary Date | Employees
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted units	80,000
Non-vested, outstanding (in shares)							80,000		80,000
Service Based Restricted Stock Units Vesting on December 31, 2018 | Employees
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted units		122,817
Non-vested, outstanding (in shares)							109,417		109,417
Number of vesting installments | Installment									1
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)							40,030		40,030
Risk-free interest rate									0.75%
Expected stock price volatility									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]
Non-vested, outstanding (in shares)							56,979		56,979
Number of vesting installments | Installment									1
Performance Based Restricted Stock Units Vesting on December 31, 2016 | Employees
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Non-vested, outstanding (in shares)							38,908		38,908
Risk-free interest rate									0.76%
Expected stock price volatility									44.84%
Service Based Restricted Stock Units Vesting on December 31, 2016 | Employees
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Non-vested, outstanding (in shares)							57,412		57,412
Number of vesting installments | Installment									1
Service Based Restricted Stock Units with specified vesting dates | Employees
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting term									3 years
Non-vested, outstanding (in shares)							4,751		4,751

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Carrying value as of the balance sheet date of obligations incurred and payable, pertaining to costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered. Examples include property accounts payable, legal liabilities, loan costs, general and administrative liabilities, but exclude interest.

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Unrecognized cost of unvested share-based compensation awards.

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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.

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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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