Schedule II - Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	$ 9,605	$ 3,152	$ 2,927
Charged to Expenses/Against Revenue	27,963	17,147	7,722
Charged to Other Account	989	0	0
Deductions	(14,717)	(10,694)	(7,497)
Balance at End of Period	23,840	9,605	3,152
Allowance for doubtful accounts
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	1,258	1,252	1,502
Charged to Expenses/Against Revenue	3,725	2,126	1,028
Charged to Other Account	0	0	0
Deductions	(2,619)	(2,120)	(1,278)
Balance at End of Period	2,364	1,258	1,252
Credit reserve
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	1,900	1,900	1,425
Charged to Expenses/Against Revenue	11,578	8,574	6,694
Charged to Other Account	0	0	0
Deductions	(11,578)	(8,574)	(6,219)
Balance at End of Period	1,900	1,900	1,900
Deferred tax asset valuation allowance
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	6,447	0
Charged to Expenses/Against Revenue	12,660	6,447
Charged to Other Account	989	0
Deductions	(520)	0
Balance at End of Period	$ 19,576	$ 6,447	$ 0