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Stockholders' Equity and Stock Incentive Plans (Restricted Stock Units, Performance Stock Units and Career Shares) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense			$ 15,518	$ 19,264	$ 18,476
Non-Option Award Activity [Roll Forward]
Shares to be issued to settle PSUs	0.59	1.67
Stock Issued During Period, Shares, Performance Stock Award Gross	213,365	654,478
Stock Issued During Period, Shares, Performance Stock Award, Taxes	54,338
Stock Issued During Period, Shares, Performance Stock Award, Net	159,027			(2,446,000)
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period			542,220	541,016	696,249
Share-based compensation expense			$ 8,883	$ 9,909	$ 8,010
Non-Option Award Activity [Roll Forward]
Outstanding, beginning of period	2,320,826	2,534,496	2,320,826	2,534,496	2,755,799
Canceled			(30,400)	(40,800)	(201,660)
Vested / awarded			(871,528)	(713,886)	(715,892)
Outstanding, end of period			1,961,118	2,320,826	2,534,496
Granted, weighted average grant date fair value (in USD per share)			$ 18.06	$ 19.05	$ 11.63
Total unrecognized share-based compensation costs related to unvested stock options			$ 0
Total unrecognized share-based compensation costs related to unvested stock options, period for recognition			2 years 3 months 24 days
Performance Stock Units (PSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period			241,235	240,156	694,294
Share-based compensation expense			$ 3,353	$ 5,135	$ 6,537
Non-Option Award Activity [Roll Forward]
Outstanding, beginning of period	1,249,480	1,411,640	1,249,480	1,411,640	821,633
Granted			380,000
Canceled			0	(2,677)	(104,287)
Vested / awarded			(213,365)	(663,945)	0
Outstanding, end of period			1,129,078	1,249,480	1,411,640
Granted, weighted average grant date fair value (in USD per share)			$ 17.75	$ 16.75	$ 11.01
Total unrecognized share-based compensation costs related to unvested stock options			$ 2,200
Total unrecognized share-based compensation costs related to unvested stock options, period for recognition			1 year 6 months 24 days
Shares to be issued to settle PSUs			1,100,000
Evaluation of performance conditions, period			3 years
Awards if no conditions met, percentage			0.00%
Awards if only threshhold performance met, percentage			50.00%
Awards for target performance, percentage			100.00%
Awards for maximum performance, percentage (up to 200%)			200.00%
Award vesting period			3 years
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense			$ 1,974	$ 2,821	$ 2,733
Non-Option Award Activity [Roll Forward]
Total unrecognized share-based compensation costs related to unvested stock options			$ 1,400
Total unrecognized share-based compensation costs related to unvested stock options, period for recognition			10 months 18 days
Performance Shares Adjustment [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period			(148,272)	264,306
Career Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period			73,064	103,018	122,015
Share-based compensation expense			$ 1,308	$ 1,399	$ 1,196
Non-Option Award Activity [Roll Forward]
Outstanding, beginning of period	968,575	896,585	968,575	896,585	894,307
Canceled			0	0	(85,765)
Vested / awarded			0	(31,028)	(33,972)
Outstanding, end of period			1,041,639	968,575	896,585
Granted, weighted average grant date fair value (in USD per share)			$ 19.01	$ 12.51	$ 11.31
Total unrecognized share-based compensation costs related to unvested stock options			$ 1,200
Executive Officer | Career Shares
Non-Option Award Activity [Roll Forward]
Award eligibility, minimum age			55 years
Award requisite service period			10 years
Service period, Tranche 1			10 years
Service period, Tranche 2			15 years
Service period, Tranche 3			20 years
Stock Incentive Plan 2012 [Member] | Stock Options
Non-Option Award Activity [Roll Forward]
Award vesting period			3 years

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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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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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Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, 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 equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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