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Stock-Based Compensation Plans and Employee Benefits (Stock-based Compensation) (Details) $ in Thousands	1 Months Ended			3 Months Ended
	Jan. 31, 2016 shares	Jan. 31, 2015 shares	May. 31, 2014 shares	Mar. 31, 2016 USD ($) Installment shares	Mar. 31, 2015 USD ($)	Dec. 31, 2015 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense | $				$ 4,577	$ 3,238
Unrecognized compensation cost | $				$ 2,700
Weighted-average period to recognize the unrecognized compensation cost				1 year 9 months 7 days
Accrued expenses | $				$ 65,226		$ 68,937
Long-term Incentive Plan 2009
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for issuance				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)	40	34
All Performance Incentive Plans
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Accrued expenses | $				$ 19,600		$ 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 on December 31, 2018 | Employees
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted units				122,817
Number of vesting installments | Installment				1
Non-vested, outstanding (in shares)				122,817
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)				48,519
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]
Number of vesting installments | Installment				1
Non-vested, outstanding (in shares)				61,557
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)				49,434
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]
Number of vesting installments | Installment				1
Non-vested, outstanding (in shares)				62,662
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)				8,751
Vesting term				3 years

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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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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.

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