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Stock-Based Compensation Plans and Employee Benefits (Stock-based Compensation) (Details) $ in Thousands					1 Months Ended					3 Months Ended
	Feb. 22, 2017 shares	Jun. 15, 2016 shares	Jan. 29, 2016 Installment 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	Mar. 31, 2017 USD ($) shares	Mar. 31, 2016 USD ($)	Dec. 31, 2016 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense | $										$ 5,881	$ 4,577
Unrecognized compensation cost | $										$ 3,000
Weighted-average period to recognize the unrecognized compensation cost										2 years 1 month 3 days
Accrued expenses | $										$ 62,139		$ 72,693
Long-term Incentive Plan 2009
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for issuance										3,400,000
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
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
2017-2018 Performance Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of points issued (in shares)					44
All Performance Incentive Plans
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Accrued expenses | $										$ 28,300		$ 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)										115,571
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 (in share)		80,000
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)			109,417
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)				39,071
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)				56,020
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 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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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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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 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.

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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.

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