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Stock-Based Compensation Plans and Employee Benefits (Stock-based Compensation) (Details) $ in Thousands		1 Months Ended				3 Months Ended		6 Months Ended
	Jun. 15, 2016 shares	Jun. 30, 2016 USD ($) shares	Jan. 31, 2016 shares	Jan. 31, 2015 shares	May 31, 2014 shares	Jun. 30, 2016 USD ($) shares	Jun. 30, 2015 USD ($)	Jun. 30, 2016 USD ($) Installment shares	Jun. 30, 2015 USD ($)	Dec. 31, 2015 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense | $						$ 1,633	$ 3,947	$ 6,211	$ 7,186
Unrecognized compensation cost | $		$ 3,000				3,000		$ 3,000
Weighted-average period to recognize the unrecognized compensation cost								2 years
Accrued expenses | $		$ 71,235				$ 71,235		$ 71,235		$ 68,937
Employees
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted units	20,000
Vested Stock, Shares Issued Net of Shares for Tax Withholding	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		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 | $		$ 19,800				$ 19,800		$ 19,800		$ 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
Non-vested, outstanding (in shares)		121,667				121,667		121,667
Number of vesting installments | Installment								1
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		80,000
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)		48,289				48,289		48,289
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)		60,637				60,637		60,637
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)		49,233				49,233		49,233
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)		61,857				61,857		61,857
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		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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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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