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Supplemental Guarantor Financial Information Supplemental Guarantor Financial Information (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Condensed Income Statements, Captions [Line Items]
Total revenues	$ 124,837us-gaap_SalesRevenueNet	$ 95,892us-gaap_SalesRevenueNet	$ 32,108us-gaap_SalesRevenueNet	$ 29,810us-gaap_SalesRevenueNet	$ 32,446us-gaap_SalesRevenueNet	$ 29,964us-gaap_SalesRevenueNet	$ 28,124us-gaap_SalesRevenueNet	$ 30,767us-gaap_SalesRevenueNet	$ 282,647us-gaap_SalesRevenueNet	$ 121,301us-gaap_SalesRevenueNet	$ 108,582us-gaap_SalesRevenueNet
Cost of revenues (excluding depreciation and amortization expense)									174,667us-gaap_CostOfRevenue	68,116us-gaap_CostOfRevenue	57,500us-gaap_CostOfRevenue
Selling, general, and administrative expense									32,100	17,467	17,270
Depreciation and amortization									41,158	14,642	13,227
Interest expense, net									12,964us-gaap_InterestExpense	469us-gaap_InterestExpense	25us-gaap_InterestExpense
Other expense, net									11,672us-gaap_OtherNonoperatingIncomeExpense	782us-gaap_OtherNonoperatingIncomeExpense	876us-gaap_OtherNonoperatingIncomeExpense
Equity in net income of subsidiaries									0	0	0
Income before income tax provision (benefit)									10,086	19,825	19,684
Provision (benefit) for income taxes									(1,172)us-gaap_IncomeTaxExpenseBenefit	2,258us-gaap_IncomeTaxExpenseBenefit	3,353us-gaap_IncomeTaxExpenseBenefit
Net income	4,361us-gaap_ProfitLoss	(2,601)us-gaap_ProfitLoss	4,879us-gaap_ProfitLoss	4,619us-gaap_ProfitLoss	6,347us-gaap_ProfitLoss	4,203us-gaap_ProfitLoss	2,478us-gaap_ProfitLoss	4,539us-gaap_ProfitLoss	11,258us-gaap_ProfitLoss	17,567us-gaap_ProfitLoss	16,331us-gaap_ProfitLoss
Other comprehensive income									(3,749)	(591)	102
Comprehensive income									7,509	16,976	16,433
Issuers [Member]
Condensed Income Statements, Captions [Line Items]
Total revenues									0	0	0
Cost of revenues (excluding depreciation and amortization expense)									0	0	0
Selling, general, and administrative expense									1,544	1,459	1,905
Depreciation and amortization									0	0	0
Interest expense, net									11,507	0	0
Other expense, net									502	0	0
Equity in net income of subsidiaries									(24,811)	(19,026)	(18,236)
Income before income tax provision (benefit)									11,258	17,567	16,331
Provision (benefit) for income taxes									0	0	0
Net income									11,258	17,567	16,331
Other comprehensive income									0	0	0
Comprehensive income									11,258	17,567	16,331
Guarantor Subsidiaries [Member]
Condensed Income Statements, Captions [Line Items]
Total revenues									249,284	89,936	78,903
Cost of revenues (excluding depreciation and amortization expense)									152,940	46,028	38,365
Selling, general, and administrative expense									27,306	12,514	12,759
Depreciation and amortization									39,828	13,229	12,284
Interest expense, net									1,354	212	(307)
Other expense, net									7,477	193	277
Equity in net income of subsidiaries									(1,832)	(1,993)	(4,038)
Income before income tax provision (benefit)									22,211	19,753	19,563
Provision (benefit) for income taxes									(2,600)	727	1,327
Net income									24,811	19,026	18,236
Other comprehensive income									0	0	0
Comprehensive income									24,811	19,026	18,236
Other Subsidiaries [Member]
Condensed Income Statements, Captions [Line Items]
Total revenues									49,172	42,223	40,383
Cost of revenues (excluding depreciation and amortization expense)									37,536	32,946	29,839
Selling, general, and administrative expense									3,250	3,494	2,606
Depreciation and amortization									1,330	1,413	943
Interest expense, net									103	257	332
Other expense, net									3,693	589	599
Equity in net income of subsidiaries									0	0	0
Income before income tax provision (benefit)									3,260	3,524	6,064
Provision (benefit) for income taxes									1,428	1,531	2,026
Net income									1,832	1,993	4,038
Other comprehensive income									(3,749)	(591)	102
Comprehensive income									(1,917)	1,402	4,140
Eliminations [Member]
Condensed Income Statements, Captions [Line Items]
Total revenues									(15,809)	(10,858)	(10,704)
Cost of revenues (excluding depreciation and amortization expense)									(15,809)	(10,858)	(10,704)
Selling, general, and administrative expense									0	0	0
Depreciation and amortization									0	0	0
Interest expense, net									0	0	0
Other expense, net									0	0	0
Equity in net income of subsidiaries									26,643	21,019	22,274
Income before income tax provision (benefit)									(26,643)	(21,019)	(22,274)
Provision (benefit) for income taxes									0	0	0
Net income									(26,643)	(21,019)	(22,274)
Other comprehensive income									0	0
Comprehensive income									$ (26,643)	$ (21,019)	$ (22,274)