Stock-Based Compensation and Other Employee Benefit Plans (Schedule of Non-Cash Stock-Based Compensation Expense) (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended	9 Months Ended	12 Months Ended
	Mar. 31, 2014	Jun. 30, 2014	Sep. 30, 2014	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Stock-Based Compensation and Other Employee Benefit Plans [Line Items]
Non-cash stock-based compensation expense	$ 3,260	$ 7,480	$ 11,584	$ 15,950		$ 12,944		$ 4,433
Income Tax Effects:
Income tax benefit from non-cash stock-based compensation				8,700		9,700		2,500
Excess tax benefit from non-cash stock-based compensation	$ 3,246	$ 3,386	$ 3,494	3,728	[1]	4,315	[1]	759	[1]
General and Administrative Expenses [Member]
Stock-Based Compensation and Other Employee Benefit Plans [Line Items]
Non-cash stock-based compensation expense				$ 15,900		$ 12,900		$ 4,400

[1] Excess tax benefits, which represent cash flows from tax deductions in excess of the tax effect of compensation expense associated with exercised stock options and vested restricted shares, are classified as financing cash flows in the Company’s consolidated statements of cash flows.