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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
	Feb. 22, 2017 Installment shares	Jun. 15, 2016 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	Sep. 30, 2017 USD ($) shares	Sep. 30, 2016 USD ($)	Sep. 30, 2017 USD ($) point shares	Sep. 30, 2016 USD ($)	Dec. 31, 2016 USD ($)	Jan. 29, 2016 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Gross contributions made by the Company | $									$ 200	$ 100	$ 1,000	$ 900
Stock-based compensation expense | $									2,934	$ 1,434	12,730	$ 7,644
Unrecognized compensation cost | $									2,100		$ 2,100
Weighted-average period to recognize the unrecognized compensation cost											1 year 6 months 13 days
Accrued expenses | $									$ 93,031		$ 93,031		$ 72,693
Long-term Incentive Plan 2009
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for issuance									3,300,000		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 | point											11.5
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 | 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 | point											4.3
All Performance Incentive Plans
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Accrued expenses | $									$ 33,100		$ 33,100		$ 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)									111,642		111,642
Service Based Restricted Stock Units Vesting 20% on each Anniversary Date
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Non-vested, outstanding (in shares)		60,000
Vesting term		4 years
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)														104,026
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)			37,514
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)			54,201
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		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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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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