Income Taxes (Details 2) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Current tax (benefit) expense
Federal	$ (5,158)	$ 14,275	$ 96,273
State	133	5,821	2,835
Foreign	3,713	7,515	4,708
Total current	(1,312)	27,611	103,816
Deferred tax expense (benefit)
Federal	51,817	2,357	(137,803)
State	5,419	551	407
Total deferred	57,236	2,908	(137,396)
Total income tax provision (benefit)	$ 55,924	$ 30,519	$ (33,580)
Percent of pretax income
Federal taxes (as a percent)	35.00%	35.00%	35.00%
State and local income taxes (as a percent)	6.10%	1.60%	1.50%
Permanent differences (as a percent)	5.80%	(20.90%)	(16.80%)
Foreign (as a percent)	5.20%	(2.20%)	(0.60%)
Valuation allowance (as a percent)	55.30%	(31.10%)	(14.00%)
Other miscellaneous items (as a percent)	(8.60%)	(2.30%)	0.30%
Actual effective income tax rate (as a percent)	98.80%	(19.90%)	5.40%
Amount of pretax income
Federal taxes	$ 19,814	$ (53,656)	$ (219,232)
State and local income taxes	3,435	(2,470)	(9,163)
Permanent differences	3,276	32,019	104,592
Foreign	2,955	3,337	3,685
Valuation allowance	31,288	47,703	92,242
Other miscellaneous items	(4,844)	3,586	(5,704)
Total income tax provision (benefit)	55,924	30,519	(33,580)
Reconciliation of liability for unrecognized tax benefits
Balance at the beginning of the period	7,036	21,564
Additions based on current year positions	561	1,142
Additions based on prior year positions	6,371	4,038
Decreases due to settlements and/or reduction in reserve	(4,743)	(5,097)
Currency translation adjustments	(9,097)	(4,844)
Settlement payments	(4,000)	(356)
Unrecognized tax benefits	33,569	44,477	49,594
Cumulative advance deposits on account	(31,371)	(37,441)	(28,030)
Balance at the end of the period	$ 2,198	$ 7,036	$ 21,564